Huey, Dewey and Louie are jerks.

What's this? Identical nephews Huey, Dewey and Louie, who are identifiable only by the differing colors of their otherwise identical caps (in the comics) or by the differing colors of their otherwise identical caps and shirts (in cartoons like DuckTales), have swapped hats! Or maybe they kept their traditional hat coloration, but traded shirts with one another! Or maybe they switched both, so that, say, Dewey is wearing Huey's cap but Louie's shirt!

And on what occasion did these little monsters decide to so confuse their own identities?

A visit to Grandma Duck's farm! Leave that poor old lady alone, you little bastards! (These images were all scanned from Grandma Duck's Little Helpers, a 1980-copyrighted Grolier Book Club Edition book; I'd tell you who drew them, but the book itself doesn't list a writer or illustrator, presumably because Walt Disney totally wrote and drew it himself.)