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'm a teacher. 

i was working with my high behavior/low skill class, and i allowed them to choose their own groups. the area i live in doesn't have much ethnic diversity, and the three black kids in my class usually choose to work together. every kid in this class is a behavioral nightmare, so it's not unusual for me to tell them that they're making a shitty partner choice, and these three are no different. here's the fu though. 

one white girl was working with them. i was giving the usual "don't do stupid shit" speech when she volunteered to keep everyone in line. 

i responded by telling her to "crack the whip if they aren't working."

we all stared at each other for a moment, then i quickly walked away.

TIFU by being unintentionally racist.