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: so, as a bit of a backstory to this so i don't sound like some kind of deviant, my family is full of trolls. we wind each other up, play terrible jokes and make awful and constant puns. my grandparents do it, my cousins and uncles do it, my mom and dad do it, everyone does it. with a younger sister in the house (she's seven, my brother is 17 and i'm 22) she's the target of a lot of the jokes but she gives back just as good as she gets.

i was looking after her when she got back from school, just sat on the scouch watching television and winding her up by putting my foot in her face (long day, feet smell.) so she got up and farted in my face. not wanting to be outdone by a small child, i held her down on the sofa and dropped one in her face.

then she screamed, not her usual laugh scream but a holyshiti'mfuckingterrified scream. then came the tears, i turned around to see my seven year old sister and half the couch covered in liquid yellow shit. to make it better, the rest of my family had just returned and now three of us were torn between horror and hilarity.

she got shit in her hair, in her mouth, up her nose, all over her. the couch is in a pretty bad state too. everything is washing and airing and i think she had about three baths. 

i'm not going to live that down for a while.

TIFU by making my younger sister cry.