A drunk falls into a cab, gives the cabbie a $20 bill and bellows "I wanna get screwed."
The cabbie dutifully drives him to the 'burbs and points out a town house.
The drunk staggers up to the front door, bangs on it, and screams "I wanna get screwed!"
A female voice answers, "Slip $100 under the door."
The drunk pushes $100 under the door. Nothing happens.
After a while the drunk bangs on the door again and screams "I wanna get screwed!"
The female voice answers, "What? Again!?"