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 didn't happen today, this happened on thursday, so sorry about that. here's a little background info. my school has three staircases, two of them go through the 1st through 4th floors, the last one goes to the basement. our schools basement only has 1 class so it's very quiet. 

i had art class as my last period class but i was running a bit late. art class was the only class in the basement, and i was held behind in a class on the third floor. after she let me out i made a mad dash to art in hopes that i wouldn't be late, even though there would be no way i could be on time. i ran down the basement staircase and through the stairwell door, when i clumsily dropped a pencil sitting on top of my pile of books. the stairs had one of those dark indents in it that nobody ever checks, and what do you know. as i turned and got my pencil i saw just a glimpse of them. we'll call them h and t. two legs were slightly poking out from outside the indent and were moving. add me lost track of what i was doing and went to investigate. i turned the corner, and there was t, mid orgasm inside of h's mouth. his bare ass rested against the tile wall as he pulled the back of her head towards his dick, making sure she swallowed. me being stupid me, let out a loud gasp, and alerted both of them. t let go and stumbled quickly to get his pants up and h spun her head around to see who i was. she screamed and cum flew out of her mouth a sprinkled on my jeans. instinctively, i tried to rub it off with my bare left hand, getting t's cum all over it. as h and t tried to get their shit together, i sprinted to the art room and opened the door with my clean hand. i guess i was loud cause i was sort of panicking, and the entire class turned around and saw me there, with smeared cum on my leg and holding my hand away from me as it dripped t's cum. now i have to explain to my guidance counselor what happened, cause i guess word spreads quick.

TIFU by being late to class [NSFW]