notalwaysright.com:

(I have a caller named Victor Krumm in the computer system. I’m a Harry Potter fan.)
Me: “Okay sir, so you’re Victor Krumm?”
Caller: “Yep, that’s me.”
Me: “Sorry this might sound funny, but did you know that there’s a book series called Harry Potter with a character with that name?”
(There’s a pause, as if he’s thinking, and suddenly he yells.)
Caller: “THE MUGGLES KNOW!”
(He hangs up. His wife calls a little while later to actually schedule.)