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: it actually happened few months ago, but i hasn't known about this subreddit. 

so i dont know if any of u have seen those videos on youtube: guys singing girls love song during university lectures. that's what my friend and i have decided to do for valentine's day (well the day before valentine's). we would just randomly walk to different lecture classrooms, and sing. i study music in my university, so i have pretty good voice. 

my turn came, and my friend chose me random hall that i supposed to go. i walked in and went straight to the first girl i saw in the first row. i took out my guitar, got to one knee, and started singing "just the way you are" and it was right in the middle of class lecture. everyone's applause, and i hand this girl a flower. (well prof cut their break time for interrupted lecture)

so everything went straight and right, however after 15 minutes i got this horrible message from my girlfriend. "that's it". something was horrible wrong.

i couldn't reach her for some time, but i caught up her near her house.
she was really upset and didnt want to talk to me. i was desperate, and asked what exactly happened. then she slapped me pretty bad, saying that she knows about my love for another girl. i was really confused, and then the realization hit me that she was in one of lecture halls i went to. well, my vision is pretty bad, so i guess i just didnt see her. it took sometime to persuade her that i had no idea who that girl was.

that mistake costed me a lot: i had to take her for nice romantic dinner right the next day. strangely, she totally refused my attempt to sing her serenade or buy flowers.

TIFU by singing a serenade to a girl other than my girlfriend