Now Hear This is a 1963 Looney Tunes cartoon directed by Chuck Jones and Maurice Noble. It is notable for being the first short using a theme sequence without the trademark orange rings. Now Hear This was nominated for an Academy Award.
When the devil loses his horn, it is found by an elderly man. When the man finds the horn, and takes it into his possesion, strange things begin to happen, resulting in a wacky 7 minutes of sound and color.