Down Missouri Way (1946)
This musical features an agriculture professor who secures a movie role for her trained mule, Shirley. To promote the film, a studio publicity man led Shirley, with an ad for the movie on her back, down Fifth Avenue and into the restaurant overlooking Rockefeller Plaza's ice rink. Managers naturally refused to seat the animal. The press showed up to record the event, so it accomplished the publicist's mission...but it didn't appear to do much for the movie, which was not a box office smash.
Check out more of Hollywood's most outrageous publicity stunts on the next page.