In a typical "green-apple-moment", we see 12 yo boy play with a sprinkler, then removing his trunks to dry them a bit, and teasing his parents who have just stopped making love.
Christian Slater (17) is pretty creepy as an evil youngster who begins terrorising his babysitter. In one scene he is taunting her with a kitten. She grabs for it, but he spins and she pulls his trousers down instead. We see his rear for a couple of seconds, as he stands up and does his trousers back up.