"What's your waist size?"
No joke. Not "how tall are you?" nor even "how much do you weigh?" I had a dude ask me what my waist size was. Nothing in the conversation prior to this question was even remotely connected to this being brought up.
But then, the guy was really weird in general. I got a lot of his family history, a detailed blow-by-blow of his family problems, a brief history of his life... One of the strangest conversations I've ever had.