People who don't believe you when you tell them that they called the wrong number.
Act I. My lab. The phone rings. Ring, ring!
Caller: Jocelyn Spagno, please.
Me: Wrong number.
Caller (huffily): How can this be the wrong number? They just told me this was her direct line! J-O-C-E-L
Me (interrupting): Sorry, definitely the wrong number.
P.S. I have Jocelyn Spagno locked in the closet and now no one will ever find her. Muwhahahaha.