Gremlins

Sure, he's cute. Of course you can keep him. But heed these three warnings: Don't ever get him wet. Keep him away from bright light. And the most important thing, the one thing you must never forget: no matter how much he cries, no matter how much he begs... never, never feed him after midnight. With these mysterious instructions, young Billy Peltzer takes possession of his cuddly new pet. He gets a whole lot more than he bargained for.