I've had a few; I bottle things up, then WHAM, explode like a pressure cooker. I'm not good at expressing my emotions. I'll add that I am thoroughly ashamed of all of them, with the exception of the last, which was a good 30 years worth of bottled up anger.
When I was younger our neighbour's (I say neighbour, she lived a good quarter of a mile away) daughter had a habit of letting herself into our house, helping herself to feed, and going into the horses field to feed them. This was a huge problem for the ponies, which were on restricted diets, plus she was actually waltzing into our house. Parents had been spoken to, parent were of the ineffectual 'my baby wouldn't do a thing like that' school.
One day I saw her do it, and a big RM descended. I snuck into the field, hopped on my pony, and when she climbed through the fence, rode full tilt at her, swerving at the last minute. She ran home sobbing, I guess I terrified the shit out of her, parents came storming round to have a go at mine, who calmly pointed out that she was actually doing exactly what they had denied. End of argument. Was quite a good outcome tbh, as she was a massive pita and never went near me again.
Second major one, and here I apologise profusely to all red heads, those of us carrying a few extra pounds (including me), and females. Went to take DD2 to a drs appointment, and discovered I couldnt get out of my drive because yet again a school run mum had parked right across it because her previous (11yo+) child couldn't walk an extra 5 yards. Asked her nicely to move, got a 'Oh I'll only be 10 minutes', followed by her winding up her window.
I lost it. Really, really lost it. In front of loads of other kids and parents. Started hammering on her window, absolutely frothing with rage. She wound her window down, and I yelled at her "MOVE YOUR FUCKING CAR YOU FAT GINGER CUNT". She moved. Again, I apologise profusely to all those offended by my words, I don't know what came over me I do it was the fucking red mist
Last one, couple of years ago, was away with DDs, my hideous mum/stepfather, and even more hideous sister. Had endured 3 days of really appalling behaviour aimed at us; simple stuff like them making everyone except us a drink, sister's frankly shit cooking being praised, mine being totally ignored, having them walk into the sitting room and changing channels without asking; just your average obvious displays of them and Golden Child being somehow above us. It was bad enough for the DDs to have kept up a text dialogue with XH, telling him what was going on, and asking him to ring the following day, to say he had hurt his back (he was dog/cat/various small animal sitting), and we needed to come home asap.
Went out for lunch, had to wait for a table because it hadn't occured to them tgat I might actually be right about needing to book. Was subjected to some quite ridiculous sniping and bitching from sister. I lost it, and slapped her found the face in front of loads of people waiting to be seated.
I am not sorry for that one, she fucking deserved it, and I should have done it decades ago. Silver lining of that one was I finally resolved to go NC, and I've not heard a peep since, bar one very long, self pitying, and par for the course poor me letter from my very ex mother. It is bliss not having them in our lives anymore.