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: my little brother, 9, is quite an agressive person when me and my dad are in the equasion. we all love eachother in the house, but it's funny to do a slight joke about him or his precious bear, named teddles, and watch his reaction. (usually flying arms and screeching. we always pay for our annoyance!) however, when i went to do it last time, i didn't think much of my stress ball, which was in his hand. i crept up behind him and grabbed his shoulders going 'raaaaagh!' mistake of the fucking year.

 if anyone has ever been smacked in the nose, hard, with a stress ball, you'll know it's like a small rock. long story short, i now have a bloody nose and a shadow of stupidity hanging over me. ouch.

TIFU by letting my brother find my stress ball