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: another this didn't happen today but quiet some years ago tifu. our second floor balcony was directly about the sun deck of the pool. mum was sun baking so i thought i'd play a hilarious trick by throwing a water ballon at her from the balcony. only problem was i couldn't find a water ballon. my teenage brain thought "i know, i'll fill a shopping bag up with water and hold it over the top and let go." so i did that. more water, more funny. mum was laying there with her eyes closed with no idea i was aiming at her head with a full to the brim with water shopping bag about to let go. when it hit, all she said was "mmph." i yelled "haa haaaaaaa" then ran down stairs to receive my funniest son of the year award to the sight of mum not moving. i looked in horror as blood started to come out of her nose. i yelled " mum" and shook her shoulders which brought her around. all she said was "you're a bloody idiot" and slowly stumbled inside.

TIFU by accidentally knocking my mum out.