Gremlins

Gremlins is a 1984 American comedy horror film directed by Joe Dante and released by Warner Bros. The film is about a young man who receives a strange creature called a mogwai as a pet, which then spawns other creatures who transform into small, destructive, evil monsters. This story was continued with a sequel, GremlinsThe New Batch, released in 1990. Unlike the lighter sequel, Gremlins opts for more black comedy, balanced against a Christmastime setting. Both films were the center of large merchandising campaigns.

Randall Rand Peltzer, a struggling inventor, visits a Chinatown antique store to find a Christmas present for his son Billy. In the store, Randall encounters a small, furry creature called a mogwai Cantonese , monster. The owner Mr. Wing refuses to sell the creature but his grandson secretly sells the mogwai to Rand, with three warnings do not expose the mogwai to bright lights or sunlight, do not let it get wet, and never feed it after midnight.Rand returns home to Kingston Falls where he gives the mogwai to Billy as a pet. Billy works in the local bank, and fears his dog Barney will be put down by the towns resident gold digger Mrs. Deagle. Rand names the mogwai Gizmo and treats him kindly but when Billys friend Pete spills a glass of water over Gizmo, five more mogwai emerge from his back, led by the aggressive Stripe. Billy shows one of the mogwai to his former science teacher Mr. Hanson, spawning another mogwai, whom Hanson subjects to painful examination. Stripes gang trick Billy into feeding them after midnight and transform into cocoons, as does Hansons mogwai. Shortly after, their cocoons hatch and they emerge as mischievous, reptilian Gremlins that torture Gizmo and try to murder Billys mother, while Hanson is killed by his Gremlin. ........

Source: Wikipedia