Punchline Meme, part ii

Since the last one wasn't a real joke (well, sort of) here's another.

Post the punchline to a favored joke. Ask for comments for people to guess or contribute the actual joke.

My Punchline:
"Arrrr!" says the pirate. "It's drivin' me nuts!"

What I'm reading: Simon Green, Nightingale's Lament