I used to be a twice-a-week-EDI-LHR-EDI passenger, and knew many of the CC fairly well. One Friday, MrsP and I were heading for London, when one of the (extremely pretty, off-duty, and in civvies with a VERY short skirt) CC sat down beside us for a blether. The conversation is seared on my memory.
Me: "Hi, ****, this is ****, you haven't met."
CC: "Hello, nice to meet you. Don't usually see you on a Friday, Magnus."
Me: "No; **** and I are heading south for a couple of days."
CC: "Oh, a dirty weekend? Don't worry, I won't tell the wife!"
MrsP: "WTF???"
Me: "Aaaaaarrrrgggghhh!!"
Establishing that it was a joke took some time . . .