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: unlike most fuck ups, this actually happened today. so i was working my shitty minimum wage job as a cashier at a local supermarket, just like any other day. as the day goes by, i like to switch between greetings for customers, calling some of them typical "sir" or "ma'am", and others get "buddy" or "boss". i never once saw this as a problem because my manager often calls me boss. boy was i wrong. this guy comes up to my register, and after i finish up his order i say, "have a nice day, boss." he then gives me the dirtiest of looks and says "don't you ever fucking call me boss again, got it?" in shock, i muster up "..oh..okay sir", and then he proceeds to go on a tirade about how kids these days have no respect and how i am using gang lingo like boss to refer to customers. he then storms out vowing never to return. all in all, my manager thought it was pretty funny.

TIFU by calling a guy boss.