From the Marx Brothers movie The Cocoanuts (1929).

Why A Duck?

I go crackers over these guys - hope you enjoy.  

Note that at 0:33, Groucho almost calls Chico "Ravelli" (the name of Chico's character in Animal Crackers), realizes his error mid-syllable, and manages to save the take. Which, for budgetary reasons, was a big deal on these early Marx Brothers pics. Always quick on his feet, that Groucho. This clip was apparently the 28th take.