Can’t think of one per se but a few come to mind
Getting yelled at in public by parents/girlfriend
Parents showing up at school.
Got invited to a club by a coworker (I don’t like clubs, never did) and when I finally got there they turned off the phone and ignored my ass so I went home.
Showing up to your shift at work to realize they just fired half the staff and they never let me know until I showed up for my next shift. When I got in I looked at the schedule and I was no longer on it (I was the night before lol) so they asked for my keys/card and then I fucked off home. I was young and didn’t realize at the time that they couldn’t do that but by the time I knew my rights it was way too late.
When I was a young kid in the mid 90s I found some paracord in the basement (dad was military) and was outside playing with it, tying it to random things. There was this path that went through a large park with a large chain link fence on both sides. I tied the paracord from one end of the fence to the other and went and did something else in the park. Then I noticed some toddler and his mom walking though the path. I guess the kid didn’t see the paracord while he was clumsily running and he got clotheslined right in the neck and fell and started crying like a mofo and I just sprinted the fuck outta there (I was about 6 at the time) 
Pretty much any time I’m with or near someone who gets pissy/causes a scene at a fast food/restaurant when an order is messed up I cringe so hard. Or when people are in long lines for cash register and talking shit about the cashier while they can hear them. I’ve worked in the restaurant industry for half my life so I really cant stand it when grown adults act like monkeys over an order being messed up or things going wrong. Especially when it’s someone I’m with and I’m as asshole by ass-ociation. You can tell a lot about a person by how they treat service staff.
When someone whispers to me talking about someone else who is still close by thinking that people can’t hear shit.
Not exactly a moment but if I ever read old posts that I made years ago I also cringe really badly and wanna smack the shit outta myself but I guess that’s growth
Being around people having debates about sex/politics/religion/ethics in public. Happened at thanksgiving at a buddies this year and I just fucked off and started shooting hoops in their net. When I finished like an hour later and they were still at it so I just went home.
One time as a 10 year old I was at a restaurant with a friend and his family and when the waiter asked what I wanted I asked for a shirley temple and the stepdad (who was prob drunk lol) started ripping into me what a little girl/baby shiiiiiiiirly temple blah blah. Funny he must have been insecure as fuck talking to a ten year old like that. I felt bad about it for a long time then I realized I can order/enjoy what the fuck I want lol. Hmm maybe I’ll order one next time I go out see if I get any looks