Billposters is a Donald and Goofy short released 17 May 1940.
Donald Duck and Goofy erect advertising posters on a farm. As Goofy prepares to post on a windmill, its blades inadvertently steal his tools and return them as they turn.
Meanwhile, a goat is munching on soup cans when it spies the picture of a soup can on one of their posters. It gobbles it up then greedily looks for more. When Donald sasses the goat, a battle ensues that culminates with both billposters riding the windmill blades and the goat butting them over and over.