Also, I made a self-deprecating joke to a customer today when I misread her weird name on her credit card, something about how I can't read or type, which was supposed to be completely ridiculous and nonsensical. It was absurd. She took it as some sort of apology I think and in a snotty tone implied that I must be a college student.
Part of me was flattered because she thought I was one of those young college kids, but I also thought she was a shit brick for not getting my humor. Or maybe she thought she was really clever and was making a superior joke. If so, I would consider her joke a failure as it produced no smiles, laughs, or chuckles, and her punch line, if that was her punch line, was poorly timed.