4. "Hehheeeeehooooo." Everyone looks at the depositor of that sound. He stares at them all and exclaims, "SHOOBY... DOOBY." They all burst into laughter from the statement of glorious joyousness.
When you and your buddy are fucking a girl, she's blowing one and taking one, then on the count of 3 you and your busy yell "SCOOBY DOOBY DICK SWAP!" And you switch places and make her ask for Scooby snacks at the end.