Slap Happy Lion is a 1947 American animated short film directed by Tex Avery and produced by Fred Quimby for Metro-Goldwyn-Mayer. Released on September 20, 1947, the short details the tragic downfall of a lion from king of the beasts to a gibbering, pill-popping wreck. It is narrated by a mouse whose torments drove him crazy. The mouse's voice was supplied by Frank Graham. Scott Bradley provided the music.