Customer pays with a $50 or $100 bill and the till requires that I check it
Customer: "It's good, I just printed it this morning."
Some days I just had to pretend I didn't hear them.
Pro tip: if you have a "go to" joke you always say in a given situation, guaranteed the person you're saying it to has already heard it several times this week. Just don't.
And before anyone responds with "they're just trying to improve your day" they're not. If I don't find the joke funny they get offended, that means they aren't doing it for me, they're doing it to show off how great and funny they are.
Pro tip: don't tell someone a joke if you're going to be offended if they don't laugh.