The origins page here says that the title of WHOOPS, I'M AN INDIAN! (1936) comes from the song "I'm An Indian". Well, I was looking at one of those public domain "300 Classic cartoons on one DVD" dealies, and it listed a cartoon entitled "Whoops! I'm a Cowboy!" Don't it seem like that would be more likely to be a pun on the Stooges short itself rather than the song... or maybe something altogether different (I haven't tried to find a release date for the cartoon...)
If I'm wrong, well then: WHOOPS!
- mnw