The Hare-Brained Hypnotist is a Bugs Bunny cartoon in the Merrie Melodies series, released on October 31, 1942. The cartoon stars Bugs Bunny and Elmer Fudd. This cartoon's plot was re-worked for the 1955 cartoon Hare Brush and its opening music was re-used in the 1946 cartoon Hair-Raising Hare, the 1952 cartoon The Super Snooper and the 1955 cartoon Hyde and Hare.
The title, instead of employing the usual "hare" vs. "hair" pun, is standard spelling, for the expression that indicates thoughtlessness or recklessness. Elmer Fudd permanently goes back to his regular design starting with this cartoon.