A salesman goes up to a house and knocks on the front door.
Its opened by a little 10-year-old boy who has a lighted cigar in one hand, a glass of whiskey in the other and a Penthouse magazine tucked under his arm.
Salesman: "Hello son. Is your mom or dad home ?"
Little boy: "What the duck do you think?"
edit: replaced F with D for the kiddies ;)