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, my youngest has trisomy 21 and cerebral palsy. she has been very slow to develop, and still struggles with many basic physical feats we take for granted. 

tonight, i had invited my in-laws to come to our house for dinner. they were in the living room and my youngest was coming through the dining area into the kitchen. from my view, it looked like she was having trouble navigating around a chair, so i came over and pulled it out of the way. 

at the moment i did so, i hear my mother-in-law shout "what the hell are you doing?!" and i watch helplessly as my daughter tumbles forward, into the corner of the cabinet that separates the kitchen and the dining room. she hit her face, starts screaming, and holding her mouth.

realizing the chair wasn't in the way, but rather, she was leaning on it for support before i pulled it away, i ask "oh, i'm sorry, were you using that?" (i know i phrased that weird, but i was thrown off by the disaster.) my mother-in-law runs over, snatches my daughter up, and walks into the other room, giving me a dirty look. my wife, who was in another room with my older kids comes in wondering what's going on, and i shrug then point to where my mother-in-law took my daughter.

my wife comes back into the kitchen and asks "ok, i got *her* story, what the hell happened?" so, i told her. my wife shakes her head and explains that, from my mother-in-law's view, i came over and mercilessly pulled the chair out from under my daughter, then teasingly asked the question, as if i were trying to be the biggest ass hole in the world. 

even after explaining the misunderstanding, my wife's mother was pretty cold to me the rest of the night, and my daughter has a really bad fat lip.

TIFU by injuring, then unknowingly taunting my special needs daughter in front of her grandparents.