Trailer Horn is a 1950 animated short film featuring Donald Duck and Chip 'n' Dale.
It was produced by Walt Disney Productions and released by RKO Radio Pictures, Inc.[1] Chip 'n' Dale wake up one morning and go out to collect nuts but then come upon Donald Duck (who is out having a nice relaxing vacation)'s footprints.
Enraged, Donald hops into his car and starts ramming the tree with it until he makes it lean like a catapult.
Chip and Dale watch from the sidelines as a dazed Donald comes out of the hood with the horn in his mouth and steering wheel in his hands, behaving like a car.
The short was released on December 11, 2007 on Walt Disney Treasures: The Chronological Donald, Volume Three: 1947-1950.