Woody woodpecker (1941)

Woody Woodpecker spends his day singing loudly and pecking holes in trees. He infuriates the other woodland creatures - when he isn't baffling them with his bizarre behavior. Woody overhears a squirrel and a group of birds gossiping about him. Even though he just sang a song proclaiming his craziness, he denies their whispered accusations that he's nuts. But after they trick him into knocking his head on a statue, the poor bird hears voices in his head and decides the animals might be right. He decides to see a doctor.