For me its when my family flew in for my graduation and they also decided to meet my sister's in-laws. After graduation we were supposed to go to a restaurant. The ceremony was supposed to last two hours but stretched to four and we were about to miss our reservation. My sister pressured me to leave even tho I didnt have a chance to take pictures with friends and such. I have mostly moved on but honestly a part of me still hates her for it.
more light hearted than the others but still meets the title -
vacuuming has always been my favorite chore and I used to love to do it for my mom when i was a little kid. one day she was picking me up from daycare and I overheard her telling the worker there about how bad i was at vacuuming
I never forgave her for it. went no contact years ago over waaaay worse shit. I don't think about any of that much... but I think about that event every single time I vacuum lol