Dinosaurs aren't old enough to smoke. Told to me by my niece at Christmas.
You can mash potatoes, but you can't pee soup. (sorry sorry. Really. I've loved this joke since I was... oh.. six...)
One less drunk.
He Shanghai.
He wanted to smoke a joint!
The Defenestration of Smaug.
They love to swim in gold coins.
Because the P is silent.
I always loved this one: (works better said out loud of course) What do you call a fish with no eyes... A FSHHH
Secretary: My lawyer.
HO HO HO, Merry Christmas!
To carry his library card.
They can't hide behind billboards.