Lighthouse Mouse is a 1955 Warner Brothers Merrie Melodies animated cartoon, written by Sid Marcus and directed by Robert McKimson, with voice characterizations provided by Mel Blanc. The short was released on March 12, 1955, and stars Sylvester and Hippety Hopper.

Plot

It is 11 o'clock at night at a lighthouse on a small island, and the clock's pendulum is intermittently deflecting the light from the beacon into a mouse-hole downstairs, keeping the resident mouse wide awake. The baggy-eyed rodent crawls out of bed, climbs the steps to the beacon, and yanks the plug out of the outlet to turn it off. Polly the parrot immediately flies into the light-keeper's bedroom squawking "Light's out! Light's out!" The lightkeeper wakes up shouting, "Grrrreat Scott! It's that crrrrazy moose (mouse) again!" Consequently, a cargo carrier named Australia crashes into the rocks on the shore of the island, causing several wooden crates to spill overboard. The frustrated captain admonishes the light-keeper to keep the beacon lit, and the light-keeper and Polly apologize for the mishap. Hippety Hopper, a baby kangaroo intended for delivery to a city zoo, is inside one of the fallen crates, and after the ship departs, he hops off within the crate until it breaks apart against the rocks, setting him free.