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 happened last week. it was the last day of high school, so we had basically nothing to do. at my school students are allowed to have laptops in class, which basically means everyone ends up playing some online game or browsing reddit when the teacher isn't paying attention. so i was sitting in a corner of the physics classroom playing hearthstone. all of a sudden the teacher comes over in a vain effort to get the students to get to "work," and sees the hearthstone on my screen. my teacher is rather socially awkward, so he doesn't say anything for a while. in an effort to break the silence, i ask, "do you play hearthstone too?" he says that he tried it a bit but then stopped playing. without thinking, i replied, "filthy casual." luckily, my teacher did not give enough fucks to get mad at me so he just kind of shook his head and walked away. still felt kind of bad though because he was a nice teacher, albeit socially awkward.

TIFU by calling my teacher a filthy casual