I was listening to JFK Ground a while back and a Comair CRJ called asking to copy their IFR clearance. It went something like this:

Comair 123: JFK Ground, Comair 1234 ready to copy IFR clearance to XYZ
JFKGROUND: Comair 1234, no can do, I can't do that

*silence*

JFKGROUND: Juuuuuuuuuust kiddin with ya Comair 1234, here you go...


I thought it was funny, and I can only imagine the Comair pilot's face when he heard that.