Stole this from Meklar...
It's friday night, and this girl wants to go out to a party, but she doesn't have a ride...so she goes downstairs and says to her dad "Dad, can I have the car keys". So he points to his balls and says, "and what are you gonna do for me"....see immediatly turns around and goes upstairs.
About 15 minutes later, she figures her father was joking, so she goes back downstairs, and says "hey dad, I know you were joking, can I please have the car keys" so he does the same thing. She runs upstairs, thinking this is just gross.
About half an hour later, she says...what the hell, I'll forget about it. So she goes downstairs asks, agian.....get the same answer...so she starts sucking him off....then she says "Dad your cock tastes like ass", and the father says "Oh yeah, I forgot....your brother has the car tonight."