After a group of boys fail to convince the girls to go skinny dipping in a lake with them, they take off their clothes and jump in anyway. A boy named Kenny (John Dunn) tries to interest the girls in a moonlight canoe ride Leslie (Lisa Buckler) goes with him. When she puts her hand in the water and mentions how warm it is, he tells her not to leave it in too long because all the water snakes and snapping turtles come out at night. He tells her that if she falls in, she could be eaten alive. Then he rocks the canoe. When she tells him to stop rocking it, he says "Why, you''re not afraid of a few snakes and turtles are you?" Then he capsizes the canoe and they both fall in the lake. She calls him a bastard and swims towards shore. He calls out to her "Hey, that's not a water snake I see over there, is it?" When she gets out, the skinny-dipping boys who are not on the dock ask her if she saw any water snakes out there. We see Kenny swim under the overturned canoe and call for Leslie. Then we see the killer's head pop out of the water then hold Kenny's head down to drown him. This is the first time we see the killer, though we don't see enough to identify him or her. (The reveal of the killer at the end is a big shock.)

The next day we see a lifeguard complaining about cleaning up the mess the kids left. He sees the canoe on the shore and complains about it. Then he lifts it up to find Kenny's dead body, covered with blood and plants. We see a close-up of Kenny's head with his mouth open, then we see a small snake crawl all the way out of the mouth.

Kudos to John Dunn for letting them put a snake in his mouth and remaining still, eyes open, as it crawled out. That's award-level acting right there. It's good the snake crawled out instead of the other direction.

The snake is a juvenile of some species, probably a juvenile rat snake. Even though we see the snake for less than a minute, there are several water snake jokes to go along with it. I assumed that the boys are teasing the girls with penis references, tied in with their skinny dipping. We have seen them play other dumb pranks. Water snakes are actually common around water in the summer on the east coast, and they are active at night, but they're not dangerous. Cottonmouths, a dangerously-venomous type of water snake, are not found north of Virginia.