While working approach control at Columbus, Georgia several years ago I had this exchange with a pilot:

Cessna 123:
"Columbus Approach, Cessna 123."

Me:
"Cessna 123, Columbus Approach."

Cessna 123:
"Columbus Approach, how far is it from here to where I'm at?"

Just try to answer that with a straight face!

Bruce Hargis
via e-mail