“Doesn’t time fly when you’re having fun.”
I don’t mind when someone says this when you’re out with friends and you’re commenting on the situation seriously. In fact, you’re stating fact. And time has probably “flown” because you were having a good time. I like having a good time.
I DO mind when people say it at work because: 1, that kind of raw sarcasm annoys me and 2, it’s not possible for the time to fly. Time doesn’t fly. Time just is. It can’t fly, it can’t run, it can’t skip (unless you have a slightly juddery clock like we do at work where it looks like it’s skipping).
P.S. My guitar is still in the boot of my car.