Its 1957 and Bob goes to pick up his date.
Peggy Sue's Father invites him in.
He asks Bob what they plan on doing.
Bob politely responds that they will probably just go to the malt shop or to a drive-in.
Peggy Sue's father suggests, "Why don't you kids go out and screw? I hear all the kids are doing it."
Bob is shocked. "Excuse me Sir?"
"Oh yes, Peggy Sue really likes to screw. She'd screw all night if we let her."
Just then, Peggy Sue comes down stairs and announces she is ready to go.
About 20 minutes later, a thoroughly disheveled Peggy Sue rushes back into the house, slams the door and screams at her father,
"Dad! The Twist! It's called the Twist!"