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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

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

678 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:
NotThisShitAgain121 · 20/04/2026 18:48

She deserved all she got nasty cow.

Friedeggswelldoneplease · 20/04/2026 18:49

paulhollywoodshairgel · 20/04/2026 17:33

I had a horrible housemate. He had this mug that only he was allowed to use. I dipped it in the toilet, let it air dry and put it back in his cupboard. I’m my defense he was an awful person.

So are you. That’s disgusting.

GravyMashMayonnaise · 20/04/2026 18:49

When I was at primary school I did something deliberate that directly caused the death of my 6 month old puppy. There was absolutely no malice, it was innocent but poorly thought through. He was a lovely little dog.

cloggedup · 20/04/2026 18:49

We had an awful meal at an expensive & supposedly good restaurant.
Amongst other things, my DH's duck had ice crystals inside !
And the wine was corked; it was replaced, but only after a lot of argument.

Despite complaining , the Manager refused to give any sort of compensation.

It was a long time ago, when restaurants took tel bookings without any checks or deposits. I picked a Saturday a few weeks ahead, then made multiple bookings to fill the place - disguising my voice & also using a friend to help.
Karma.

Sprungy · 20/04/2026 18:52

Worked for a company where a director sexually harassed me then sacked me because he could. I was about 18 and I used the remains of the week when they left me on site for to cancel company bookings starting with the ones furthest away. By leaving day I had spent three days cancelling jobs (with reasons that left the company looking dodgy) and left before the shit hit the fan. Whenever I read about people losing their jobs and being escorted out of the building I think yeah I get that manoeuvre!

I also bullied my bully for years and used to detach any boyfriends she had the prospect of gaining. Our social status had reversed by the time I was 15 or so and I was a shit to her. It seems like karma but it wasn’t right.

There are about three men I treated awfully while thinking I was being ok. One left his job, one moved and the other made some poor decisions. I walked off without a backward glance in all cases having caused the drama with being disingenuous.

The other worse things I wouldn’t put into print! Nit even anonymously!

LittlestBoho · 20/04/2026 18:53

LapisBlue · 20/04/2026 18:42

No, I was single on both occasions! When I think about my traumatised divorced life now it's as if I was a different person.

PS,: Neil was the best one.

That's not a bad thing. You didn't hurt anyone, you were just living your life and having the experiences that suited you at that moment.

P.S. can I get Neil's phone number?

Allseeingallknowing · 20/04/2026 18:54

MerelyPlaying · 20/04/2026 18:24

Went back to my home (still paying the mortgage) after separation from my husband to collect some stuff and found the OW had moved some things in and was clearly staying there if not actually living there.

i used their toothbrushes to clean the toilet. And then I diluted some of her shampoo and shower gel bottles with a little bit of piss. Actually I’m not sure it was a bad thing - it made me feel much better.

Plus her teeth were nice and white!

LapisBlue · 20/04/2026 18:56

LittlestBoho · 20/04/2026 18:53

That's not a bad thing. You didn't hurt anyone, you were just living your life and having the experiences that suited you at that moment.

P.S. can I get Neil's phone number?

True
I was with Neil for four years afterwards. He was the one who got away.

Friedeggswelldoneplease · 20/04/2026 18:57

GravyMashMayonnaise · 20/04/2026 18:49

When I was at primary school I did something deliberate that directly caused the death of my 6 month old puppy. There was absolutely no malice, it was innocent but poorly thought through. He was a lovely little dog.

What did you do?

Allseeingallknowing · 20/04/2026 18:57

GrueyTwoey · 20/04/2026 18:17

Pissed in a pint glass abd threw it out of the window.
I was young, and drunk.

What, glass and all?

Elanol · 20/04/2026 18:57

I was in an abusive relationship. He was a really nasty bastard. Towards the end he was cheating. It was obvious but he thought I didn't know.

I didn't say anything. She was my ticket out of there, so I let her have him. Silly girl married him a few months after we finished. Bet she won't shag someone else's boyfriend again.....

iamfedupwiththis · 20/04/2026 18:58

Beaniebobbins · 20/04/2026 18:39

Very much depends on where you had the poo! 😂

In a very secluded wood, up a hill behind a gate, no one could see me, I was an hour away from the car, I would never have made it back, I was on my own, I covered it in grass.

Very embarrassed, I do have IBS ( I don't make a habit of it )

SweetcornFritter · 20/04/2026 19:00

Slapped a fellow (male) student across the face at a college disco for no apparent reason other than I was drunk.

Stolen a bottle of wine from an off licence that had already had its window smashed in.

Not visiting my friend in hospital as regularly as I should have done when he was dying with Aids (though in my defence I was heavily pregnant at the time and getting to the hospital on the tube was a nightmare).

Beaniebobbins · 20/04/2026 19:03

iamfedupwiththis · 20/04/2026 18:58

In a very secluded wood, up a hill behind a gate, no one could see me, I was an hour away from the car, I would never have made it back, I was on my own, I covered it in grass.

Very embarrassed, I do have IBS ( I don't make a habit of it )

That’s ok. If you need to go you need to go. It’s not like you did it on someone’s front door step!

Allseeingallknowing · 20/04/2026 19:03

This reply has been deleted

Message deleted by MNHQ. Here's a link to our Talk Guidelines.

Terrible. I hope you grew up to be a better person

oohyoudevilyou · 20/04/2026 19:04

I cheated on someone who loved me very much, lied extravagantly to cover myself, then dumped him in a cruel and ill-timed manner. I hope my treatment of him didn't ruin his chances of happiness in future relationships, but he was very hurt so I suspect he carried some scars

HoppityBun · 20/04/2026 19:04

Friedeggswelldoneplease · 20/04/2026 18:57

What did you do?

Please don’t tell us!

LittlestBoho · 20/04/2026 19:04

iamfedupwiththis · 20/04/2026 18:58

In a very secluded wood, up a hill behind a gate, no one could see me, I was an hour away from the car, I would never have made it back, I was on my own, I covered it in grass.

Very embarrassed, I do have IBS ( I don't make a habit of it )

That isn't bad! If you'd done it in the middle of the playground at school finishing time then yes, that would be horrendous, but wild pooing in the woods on a run is an act of desperation!

Allseeingallknowing · 20/04/2026 19:06

WhatKindOfCake · 20/04/2026 18:38

That's seriously the worse thing you've ever done? Left a big pair of trainers outside your door? You must be a saint!

Reminds me of former PM Theresa May who said the worst thing she ever did was running through a field of corn, flattening it!

moderndilemma · 20/04/2026 19:06

MayaLui · 20/04/2026 18:14

Had a row with my sister on her wedding day about how I felt she'd excluded me from the day. We were very close and I was a mess about her getting married - felt like I was losing her, was upset about our family changing shape. I totally lost my mind, no excuses. We patched it up and are close again many years on but I still can't believe I behaved so abominably and it did a lot of damage to our relationship for years (and I don't think her husband will ever think much of me).

Oh I empathise with you.

I was a sullen cow when my sister was getting married. tbf (to me) I was 18 and still lived at home. Every part of our household was focussed on 'the wedding'. There was an engagement party (and lots of gifts), then there was all the choosing the wedding dress faff - she was lovely, looked great in them all, why all the trailing around shop after shop? I was a bridesmaid and all I wanted was to be chic and sophisticated (preferably in deep dark red and very sexy) and not wrapped up in peach lace (it was the 1980s). dsis vetoed every dress I liked and I ended up with a flouncy pale peach flowery bedspread. Homemade by my Mum. I huffed and puffed at every fitting.

Dsis lived away from home so whenever she came back all the conversation was about 'the wedding'. Other visitors came and said "oh you must be so excited about 'the wedding'". I was not. I was bored of it. And I was probably quite jealous of all the excitement and the attention on my sister.

All the photos show me with the moodiest face ever. Sorry dsis.

Elanol · 20/04/2026 19:08

WhatKindOfCake · 20/04/2026 18:38

That's seriously the worse thing you've ever done? Left a big pair of trainers outside your door? You must be a saint!

I've never threatened anyone with violence.

It felt bad but I had to do something. I'd put the feelers out to find someone who would pretend to be the owners of the trainers. Someone who could have a quiet word......

I didn't need to but I would have.

SabrinaThwaite · 20/04/2026 19:09

iamfedupwiththis · 20/04/2026 18:58

In a very secluded wood, up a hill behind a gate, no one could see me, I was an hour away from the car, I would never have made it back, I was on my own, I covered it in grass.

Very embarrassed, I do have IBS ( I don't make a habit of it )

I once had a poo in the garden of a rental house and blamed it on next door’s Alsatian.

I had rented the whole 2 bed house but the landlord stuck a weird girl with narcolepsy in the spare bedroom, and she had a habit of falling asleep in the only bathroom.

Felt bad for the Alsatian, who was a lovely dog but lived a lonely life stuck in the garden. I was sooo tempted to dog nap it when I left.

CPNSBH · 20/04/2026 19:10

When I was in my twenties I slept with a married man around 3 times a week for around 12 months. I don’t know why, I didn’t even like him that much.

FessionHole · 20/04/2026 19:10

Mines pretty bad. Had an affair for over a year (very long time ago and fully forgiven/moved on from).
The other bad thing though was after the relationship with AP ended, I was struggling with going NC although knew I had to. I knew APs laptop password and turns out that was the same for email, and later a dating site. I spent 6 months knowing AP was having dates, and eventually what was obviously a very toxic relationship thereafter. Thankfully the passwords were changed eventually and I stopped being able to access, which I am thankful for as I was then able to move on. Was a huge invasion of privacy and I have never told a single soul. AP obviously never knew and we have not had any contact since, but I regret it hugely.

GertrudePerkinsPaperyThing · 20/04/2026 19:10

Elanol · 20/04/2026 17:56

I had a neighbour who slammed his front door. I jumped out of my skin every time. They are heavy fire doors and really loud. Sometimes the vibration ran across my floor.

I made numerous complaints to the management company but he didn't give a shit. Lockdown was awful, he was home all day and never went back to work. One day after 22 (yes 22 not a typo) slams I lost my shit.

I bought a huge pair of trainers in a charity shop so they looked worn. I put them outside my door. Suddenly he could close the door properly. Funny that....

It's a shame it took a threat of violence from the man who fits into those huge trainers to behave decently.

I don’t think you did anything wrong there!