Johnny shows up Sat nite to pickup Betty for the prom and her dad answers the door, "So Johnny, where you kids off too?" Sir, we're going to dinner first then to the dance" Father asks, "Are you going to screw tonight?" Johnny, red in the face replies "Sir?" Father answers, "Screw, Betty loves to screw, she would screw all night if we didn't make her come home by 11:00, so you kids have a great time" Betty comes down and they leave. 20 mins later Betty comes running back through the door, "DAD! IT'S CALLED THE TWIST, NOT THE THE SCREW, THE TWIST!".