The Incredible Mr. Limpet is a 1964 American live-action/animated hybrid comedy film produced by Warner Bros. and based on the 1942 novel Mr. Limpet by Theodore Pratt. It is about a man named Henry Limpet who turns into a talking fish and helps the U.S. Navy locate and destroy Nazi submarines. Don Knotts plays the title character. The live action was directed by Arthur Lubin, while the animation was directed by Bill Tytla, Robert McKimson, Hawley Pratt, and Gerry Chiniquy at Warner Bros. Cartoons. Music includes songs by Sammy Fain, in collaboration with Harold Adamson, including "I Wish I Were a Fish", "Be Careful How You Wish" and "Deep Rapture". The film received mixed reviews. It was the final project for Warner Bros. Cartoons prior to its closure in May 1963.