When I was younger, my then-girlfriend (now wife) and I would frequent the Rocky Horror Picture Show at the Nuart in Santa Monica, California. The movie was always preceded by some previews (Talking Heads Stop Making Sense, Buckaroo Banzai, Repo Man) and one cartoon, "Rock-A-Bye-Bear." Two stills are below; click to hear a sound clip.
Check out all the Avery goodness at this Tex Avery tribute site (thanks, Drawn!).