Definition: In this task, you are given a Reddit post as a text. Your task is to generate a title for this text. The title should start with "TIFU by", followed by a situation that caused humor. The title should contain 7-12 words, ideally.
Input: Text: this actually happened a few years ago, it was right after my junior year of highschool.  

my older friend zach was throwing a graduation party at his house, i didnt have a car, so me and my friend went together.  we got there and the party was over, i misread the invitation or something, but zach invited us in, where his family was having a smaller "after party" with his immediate family and his grandparents.  

it turned out being really fun, his family was hilarious, so it felt like we were all just hanging out.  i really had to pee, so i went to the bathroom, and before i whipped my dick out, zach jumps out from behind his shower curtain yelling "boo" i freaked the fuck out but managed to hold my piss in.  i ended up not going to the bathroom there because there was no lock in the bathroom and i was scared i'd get pranked again. 

so me and my friend started driving home, it was going to be a 20 minute drive and now i reaaaaally had to piss.  we were on a back street and hadn't seen another car yet, so my friend told me to get out and piss on the side of the road.  she pulled over, i got out and started my business.  the side of the road was a steep slanted hill, so i had one hand on a tree, to keep my balance and not fall over.

all of a sudden, down the road i see headlights, my mind went straight to "shit what if its a cop and i get in trouble for public urination" so i take my hand off the tree to pull up my pants really fast, but as soon as i do, i fall forward, i didn't even get my pants up, so im somersaulting down this hill and my bare ass and dick are out, by the time i reach the bottom of the hill, i have dirt all over me, and then i realized i was still pissing while i was rolling down.  

i walk back up the hill and my friend was laughing so much, saying the car didnt even pass her, that it turned before it got to us. i had to sit on my napsack the whole way home so i wouldn't get dirt and piss on my friends seat.

TIFU by peeing on myself while rolling down a hill.