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Share your dilemmas and get honest opinions from other Mumsnetters.

What’s the worst thing you’ve ever done?

724 replies

shehardlysleeps · 20/04/2026 17:18

I’m in a reflective mood, and it’s got me thinking about something I did a few years ago which is probably the thing I’m most deeply ashamed of.

There was a coworker who really rubbed me up the wrong way. I was very unhappy at the time, and going through an awful time personally. She would make snide comments about me, do things with my family members (who were colleagues too) which really got my back up, I felt like she judged me harshly and was pretty rude. Along with another colleague they made three or four very nasty comments which still stick with me.

Instead of raising a grievance, which I should have done, I took to posting about her on another website (along the lines of Mumsnet), not realising she used it too. She saw the posts and reported me, and I ended up facing a meeting with HR and a senior partner of the firm I was working in. It damaged my reputation within the firm forever and I ended up leaving after not being offered a promotion. I still feel ashamed of it now, nearly half a decade on, and feel like it’s tarred me forever.

Whats the worst thing you’ve ever done?

OP posts:
SabrinaThwaite · 20/04/2026 19:55

LadyKenya · 20/04/2026 19:49

Shoes on the kitchen counter! if that was me, he would have been under the patio!

My job back then regularly involved digging grave sized holes, I’ve often thought how easy it would be to quietly dispose of a body in one of them.

If only I could weave that into a crime novel and make my fortune.

Brightbluesomething · 20/04/2026 19:55

EineReiseDurchDieZeit · 20/04/2026 18:16

I broke someone’s heart very badly. I was in a difficult and stressful situation and I acted thoughtlessly. I still feel like shit about it

Same here. And I knew I was doing it. But in my defence he broke mine first with his behaviour.
Lesson learned, love isn’t enough. It takes work to keep choosing someone every day and you both have to do it.
Not uplifting sadly but realistic.

Elanol · 20/04/2026 19:56

GertrudePerkinsPaperyThing · 20/04/2026 19:10

I don’t think you did anything wrong there!

It felt bad because I've never threatened anyone before or since. We know the man who fitted into the trainers didn't exist but my neighbour didn't.

I did do something before the trainers. It's very specific and might be outing so I'll be vague. It's a listed building and I reported him for unauthorised changes to his flat. He was made to carry out expensive remedial work. He knew it was me and still kept slamming the door.

Allschoolsareartschools · 20/04/2026 19:57

Oh dear this thread has bought back memories! In my late teens, early 20s I did some really not great things.
Firstly, I had a nanny job I hated so a nanny friend & I spent time sending taxis & pizzas to the house. Awful behaviour.
Moving on to another job, a colleague really got on my nerves so I exaggerated an incident with her & she got the sack.
Showed another really nasty colleague a picture of a spider (knew she was phobic but ...) & she had a panic attack.
Best/worst one was leaving a message on my friend's bosses answer machine pretending to be another woman. His wife gave him a black eye. I know it sounds bad but he was a right cheat & horrible to my friend.
OMG not sure if this is cathartic or deeply shameful!
It was all around 40 years ago in the dsys of phone boxes & no tracking. I wouldn't do it now would I...?

UhOhRatPoo · 20/04/2026 19:59

I once lied to airline staff that my Dad had had a heart attack so I could get swapped to an earlier flight home from a backpacking trip as I was bored and had run out of money. I was about 22.

He was fine then (absolutely perfect health) but he died three years later, in his early fifties, of a sudden and aggressive cancer that came out of nowhere. I feel like I tempted fate.

I also smacked the kids that I looked after when I was a teenage au pair. The parents told me to discipline them like that and I had been smacked as a child (we all were in the 70s/80s) so I didn’t question it. I have been thinking about that a lot now my DS is the same age as the boy I smacked. I would never lay a hand on DS.

FleetwoodMcDonalds · 20/04/2026 20:00

I was having a shitty day ruminating on some shit in my past. 13 years ago to be precise. this thread has made me feel loads better

It was so bad I felt tense in my chest and jaw!

Thank you!

cheekynamechang3 · 20/04/2026 20:00

thebabewiththepowder · 20/04/2026 19:49

An old flame reached out and told me how in love with me he was blah blah blah so I sent the screenshots to his fiancé. I did feel pretty bad because he was RUDE, said she was boring in bed etc but she needed to know. She married him a few weeks later. I wish I had kept my mouth shut to be honest as I think it caused unnecessary upset. Still feel guilty even though it was years ago and they’re still married with kids.

more fool her for marrying him

DerangedLunatic · 20/04/2026 20:01

I cheated on my PhD. Made up some results.

Tbh. I hated being a research student and I was severely depressed and no-one noticed.

usedtobeaylis · 20/04/2026 20:01

cheekynamechang3 · 20/04/2026 19:49

This reminds me of some joke scratch cards my BIL bought. He gave them to some of the relatives at Christmas (e.g the other BIL) and some of their friends.

The scratch cards made it look like you'd won £250k or similar.

The BIL fell out with some of the people he gave these to.

I hate those 'pranks', there's nothing funny in someone thinking their life has just changed beyond recognition only to whip it away again. I would fall out with someone who done that too.

Momlife86 · 20/04/2026 20:01

As a teen I really liked someone but he had a girlfriend so I befriended her so I could be close to the bf. We would have sleepovers and all at her house, she was nothing but nice to me and I returned the favour by kissing her bf.

I look back now (at 40) and I feel so much guilt about somethings I did and said in my teens / 20’s.
My Mam was ill when I was a teen and I had way too much freedom. I genuinely wish they had been stricter on me as I got into some situations that could have ended badly.
I don’t blame my parents, they were doing their best but I just wish things had been a bit different.

The worst thing I did was in my early 20s and I hooked up with a guest staying at the hotel I worked in. I had a bf and it devastated him. That action spiraled my life for a while. I was stringing them both along, a lot of people got hurt and also ended up with bf having a one night stand with someone and she got pregnant.
It took a lot of work in my 30s to get over what I did & sometimes now I get such a feeling of guilt in the pit of my stomach.

SurvivalInstinctsOfABakedPotato · 20/04/2026 20:02

SerendipityCat · 20/04/2026 18:31

Accidentally killed a duck, or at least contributed to a duck's death. I was about 10, and skimming flat stones across a local pond. I found a perfectly shaped, perfectly weighted stone and launched it with all my might. It skipped beautifully a couple of times and hit an unfortunate mallard drake smack on the back of the head. It gave a piteous quack, its neck fell to the side at an odd angle, and it started paddling in circles. As if I wasn't horrified enough, three or four other drakes immediately attacked it, and pecked it to death.

I still feel guilty nearly 60 years on!

I very rarely laugh out loud when I read things but this has me pissing myself like the scene from about a boy 😂😂😂

Wiseplumant · 20/04/2026 20:03

I slept with my best friends boyfriend when we were in our late teens. I would really like to catch up with her now, we got on so well and did stay in touch for quite a few years after she moved away. It was over 40 years ago but I still feel too guilty to contact her. She was very morally upright and I don't think she would take it well even after all this time and I would feel too much of a hypocrite to try to revive the friendship. My loss.

DevilsKitchen · 20/04/2026 20:03

I don’t know if it’s the “worst” thing I’ve done but when I was about 15 I broke a friend’s laptop. It was on the floor while a group of us were at his house, and I trod on it. I heard the screen crack and just ignored it. Later when he noticed, he asked if anyone knew anything about it and I said nothing. I still don’t know why I didn’t just say sorry and offer to replace it.

Ellaitchar · 20/04/2026 20:03

When I was 15ish 20 years ago my mum found out that my brother had been using the family PC to watch porn. He was adamant that he hadn't, and blamed my dad. The pair of them blamed the other and my mum was angry with them both. I kept extremely quiet because actually it was me. I have never told anyone, and very quickly learned about private browsing.

Twattergy · 20/04/2026 20:06

In my very early 20s I slept with a friend's boyfriend. She was in my wider circle of friends, so not that close, and I was much better pals with her boyfriend, but still, Im not that proud of it. He initiated it, but I didn't say no.

DerangedLunatic · 20/04/2026 20:08

SurvivalInstinctsOfABakedPotato · 20/04/2026 20:02

I very rarely laugh out loud when I read things but this has me pissing myself like the scene from about a boy 😂😂😂

Get some help. Wtf

Whatexcellentboiledpotatoes · 20/04/2026 20:10

iamfedupwiththis · 20/04/2026 17:28

Not sure if having a poo outside as I was desperate is better or worse than an affair.

I had a poo in a size 3 nappy on the middle of my kitchen as a fully grown adult once. So you're good.

GravyMashMayonnaise · 20/04/2026 20:10

Friedeggswelldoneplease · 20/04/2026 18:57

What did you do?

Our back door was like a stable door. I opened the top half and wanted him to jump up at the bottom half so I could pet him from inside the house. I pretended to open the back door so he'd put his front paws against it, which he did, but he fell backwards and broke his back on the edge of the step. He was put to sleep a week or so later.

Someone else asked if I ever got over it, and no, I haven't. I feel awful about it to this day - possibly because I don't think I told anyone about it at the time.

Like I said, completely innocent but caused his death nonetheless.

Thepossibility · 20/04/2026 20:11

A lot of stuff I did under the influence. And pulled a boys hair in primary school, I feel really bad about that.

Wiseplumant · 20/04/2026 20:11

Friedeggswelldoneplease · 20/04/2026 18:49

So are you. That’s disgusting.

Not here for judgement.

SurvivalInstinctsOfABakedPotato · 20/04/2026 20:13

Mine is having a physical fight with my older teenage son when he was 15. As in a full on physical fisticuffs.
I was a single parent with no male role model and he was trying to exert his own control and would be very manipulative. One day we both lost it at one another and lashed out with us both giving as good as we got. It ended when we both fell over a chair onto the floor and the chair smashed.

I have dine a lot of crappy things but most are amusing anecdotes. This is the thing that I actually feel bad for.

We had massive talks after and spent a lot of time figuring out how to live together with his raging hormones and my peri menopausal anger.

We are actually really close now and talk about this as a pivotal moment, him for growing up and learning about respect and boundaries and me for learning how to control my frustrations over not having control, and accepting we are human and some space is probably a really good thing

To lighten the mood I once put my gerbil cage in the wardrobe when about 11 as they were being noisy and keeping me awake. Turned out it was one being noisy because the other one was eating it. There were even little paw marks where it had been trying to escape.
That made me feel bad for years as a kid!!!

Seabubbles · 20/04/2026 20:14

This is going to my grave and in my 40s I am still chewed up with guilt. When I was 19 a friend of mine had started seeing this bloke and was really into him. He was French and bloody drop dead gorgeous.
Me had my friend worked together and on a Monday morning I came to work and she was so upset because she hadn't heard from him all weekend and just felt he wasn't into her.
I consoled her, beginning to seriously regret the cold hard reality that I had met up with him for a drink Friday night and we'd stayed in bed in a hotel literally all weekend until Monday morning, and it remains up there with the most passionate, exciting and naughty sex I've ever had. He went back to Paris not long after as he got fired from his job and got a new job at a posh hotel there.
That was over 25 years ago and my friend still genuinely has no idea and I do feel like such a shit, I've honestly tried to pluck up the courage to confess a few times but I know she would never speak to me again, not necessarily because of the guy, but because of my level of betrayal. I'm now married with Children and still ashamed of myself.

Dollymylove · 20/04/2026 20:15

Slept with 3 of my bosses ( not all at the same time and over a period of a few years)
All 3 of them were married. Behaved like a bitch to more than one person. Probably made them feel awful. I felt justified because others had been bitchy and made me feel awful in the past. I feel ashamed still abiut my behaviour even though it was years ago.
Stole my sisters favourite blouse and blamed it on my younger sister. A couple of years later I sold it back to her under the guise of finding an identical one in a charity shop 😉 she deserved it though because she was always nicking my stuff 😆
Made my manager a cup of coffee using brown sauce and hot water ( it looked just like coffee) unfortunately I gave myself away because I couldn't stop laughing and he realised I had "doctored" it 🤣

Jellybelly80 · 20/04/2026 20:16

DerangedLunatic · 20/04/2026 20:08

Get some help. Wtf

I laughed as well. It was so well written.

Brightbluesomething · 20/04/2026 20:17

Whatexcellentboiledpotatoes · 20/04/2026 20:10

I had a poo in a size 3 nappy on the middle of my kitchen as a fully grown adult once. So you're good.

Edited

What have I just read! Please tell me this was a medical necessity and not a fetish!