A group of teen party-goers are gathered on the beach doing teen party things: smoking, drinking, playing folk guitar, boiling lobsters, open-mouthed kissing… Blech!
A blonde girl named Chrissie runs off with a blonde boy to go skinny-dipping in the ocean.
She jumps in and starts swimming out to a buoy, but he's too drunk to make it to the finish line and passes out on the beach. Teens, alcohol, and the beach. What could go wrong?
The camera switches to an underwater POV angle. Who's watching? Cue the scary music! Something strong pulls Chrissie underwater and thrashes her around like a rag doll.
Back on the beach, loverboy doesn't hear her frantic screams.
Finally, she's pulled underwater without a trace. Friends don't let friends go skinny-dipping alone off Amity Island, kids.