Good one!
Here is the best one that I have heard in a while:
A salesman walks up to a house and rings the door bell.
A ten year old boy comes to the door with a glass of scotch in one hand, a lit cigar in the other hand and a Penthouse magazine tucked under his arm.
The salesman asks, "Son, is your mother or father home?"
The kid answers, "What the f#%k do you think!"
Tim