Compliments of my friend, Traci:
A blonde walks into the local auto parts store.(click "more" to see what she drew)
"I need a seven ten cap," she says.
"What's a seven ten cap?" replies the clerk
She says, "You know, it's right on the engine. Mine got lost somehow and I need a new one."
"What kind of a car is it?" the clerk asks, now thinking it's maybe for an old Datsun Seven Ten.
"It's a Ford," says the blonde.
So now the clerk is really confused.
"Okay, lady, how big is it?" She makes a circle with her hands about 3 1/2 inches in diameter.
"What does it do?" the clerk asks.
"I don't know," says the blonde, "but it's always been there, and now I've lost it and I need a new one."
Finally the clerk gives her a piece of paper and a pencil and asks her if she can draw a picture of it.