Good one Dutch! Frances - don't quit your day job!
Here's a few more lame ones:
What is a dentist's favorite musical instrument?
A tuba toothpaste. (sorry - I had to start with that)
What's Mary short for?
She's got no legs.
a man kept coming to mary lous cafe and ordering ham & eggs.
to play a prank, mary lou scratched ham & eggs off the menu.
the next time he came in, she handed him the menu, saying honey,
i just scratched what you like! well, he replied, wash your
fingers and get me some ham & eggs!