Tell him the key signature has 8 sharps.
or
You'd be annoyed if you opened it and a socket set fell out!"
or
It's someone who knows how to play the bagpipes, but doesn't.
or
A dead centipede.
or
None; assholes never see the light anyway.
or
A hippopota-mess
or
None. They just steal somebody else's light.
or
He was booked for a salt and battery.
or
Because Mercury moved in.
or