Terribly Impractical Language Skills
I worked at a drug store in high school. I had a German couple check out at my register, and they were incredibly rude. They were complaining in German about the customers behind them in line, using vulgar language and whatnot.
Apparently, I wasn’t moving fast enough for their liking, and the woman called me a name in German. But she didn’t know one thing.
She was obviously not aware that that was the terribly impractical language that I took in high school. When I finished their order, I stared her in the eye and said thank you in her native tongue, and they both looked shocked and embarrassed. It felt good, man.
Story credit: Reddit / DjNeedles