What are your most embarrassing underwear stories?

Mine didn't happen to me but to a friend but I was there, we were playing manhunt in the dark and we did teams and me and my friend decided to hide together and while we were hiding he told me to pull down his pants because his pants were black and would cover himself up so he wouldn't get found and I looked at him at first like are you kidding me but he said just do it so I did and I felt kinda akward but I pulled them down like I said and he was wearing these black boxer briefs and I was surprised because he was like one of those cool popular kids and I thought he wouldn't let me do that and he wouldn't be wearing boxer briefs but he did and we ended up getting found and he told my friends that I pulled his pants down and when we were found he had his pants all the way down and the whole time I was smack up against his butt because of the way we were hiding so I felt embarrassed and im sure he did too