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: i've been a long term sub for a while now and this isn't quite from today, but oh well.
one of the first days at my current assignment an announcement came over the pa stating "we are on lockdown." so, being trained in this from other assignments, i turned off the lights, had the students get out of sight (not easy as the classroom had six big windows from the hall, but apparently 6 middle schoolers can fit under my desk /r/til). i then realized that one of the locks on one of the classroom's two doors was jammed, so i sat my butt right in front of it (i'm a big guy, that door ain't movin') to prevent entry.
there was the usual giggling and people thinking "oh, i'm going to play fart machine on my phone now", but for the most part, students were on it. after a few minutes i saw another teacher patrolling the hallway and doing a few passes by my windows. finally, he comes around to the door i'm sitting in front of and knocks, then tries to open the door himself...it doesn't budge. figuring that the science teacher isn't trying to kill everyone, i get up and open the door for him. he then advises me that "oh, this is just a tier 1 lockdown. you can just lock your door and keep on teaching"
i embarrassingly turn on the lights and he looks around and goes "oh wow, you had students in here? i had no idea."

turns out they just didn't want kids in the hall while they had drug dogs sniffing around.

TIFU by putting my classroom on full lockdown.