Gremlins 1984

After receiving an exotic small animal as a Christmas gift, a young man inadvertently breaks three important rules concerning his new pet, which unleashes a horde of malevolently mischievous creatures on a small town.

Billy's holiday gift is a furry, big-eyed creature named Gizmo, who comes with a handful of strict instructions. When Billy's carelessness lets loose a swarm of wickedly playful monsters, the sleepy town of Kingston Falls is thrown into chaos on Christmas Eve.