You hear it a lot.
“Tell me something I don’t know.”
A couple of times I have heard weird replies that made me laugh.
The most recent was on the show Elementary. Someone said it, and Watson, or Holmes (which name is the man?) came back with one which brought a rare hearty laugh from me. He said, “Pigs orgasms last up to thirty minutes.”

Now, there are a bazilliony million things I don’t know, but what are some great ones to use for that moment, which are both bizarre, and likely not well known?