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 was about a year ago. so, i was lining up for our end of year assembly. it takes place in the sports hall, and it is always a pain in the ass to get out of after. so, i was with my friend, let's call him dave, trying to get out of this bloody sports hall. whilst waiting, he decided to randomly punch me in the arm fairly hard. i responded with 'you prick!' and smiled. smiling being the indicator for my revenge. i tripped him up, and what followed was possibly one of the funniest things but worst things i've ever done. 

due to the large crowd exiting the hall, it kind of had a domino effect. dave fell over, into another girl's ass (already unbelievably funny) and everyone just fell into each other. this went on for about 25 people, smacking straight down on to the concrete floor. in the end, my act of idiocy knocked about 25 people over, 3 being knocked unconscious and my former best friend now hating me, as he got the blame, even though i confessed for tripping him over. so, he got a full week of one hour after-school detentions.

TIFU by tripping someone over