"Humor, eh? Well, you're in luck; it's a well known fact that ducks are the funniest animals on the planet!"
<Marius rubs the under part of his bill where a chin would be as he momentarily stares off into space.>
"Though, I have no idea why..."
<He snaps back to attention>
"Well, different people find different things to be funny and there are lots of different types of humor; <counting off on his four fwingers> satire, impressions, word play, puns, parody, pranks, joke telling, slapstick...<he stops after running out of fwingers> the idea is to make someone laugh. Sometimes it's at someone else's expense and there's a limit to how far that can go before it's not funny anymore. Anything in particular you're interested in?"