The funniest ever?? You could make a case.

Rating: 10/10 (11 October 1999)

My favorite Marx Brother was always Harpo. His faces and body language were the earthly manifestation of pure, unadulterated comedy. And he loved the ladies, which I can respect. Groucho obviously had the best lines, and is probably closest to my own attempts at humor. And Chico... Well, Chico was the man. I'll even give Zeppo his props, seeing as their best movies were the ones he appeared in. And Duck Soup was the best of the best.
The plot? What, are you kidding? It's a Marx Brothers movie! No, seriously, this one has a neat, subversive little anti-war/government message (hidden deeply, I'll grant you). Groucho is somehow appointed leader of Freedonia, and a war ensues. That pretty much wraps it up.
What makes this the best Marx Brothers movie (and hence one of the finest comedic film of all time)? I think it's the relative lack of slow moments. So many of their movies, especially the latter ones, are dragged down continuously by the awful musical sequences that spotlight whatever lame, warbling "talent" they were using for the unnecessary love story. The songs in Duck Soup are actually pretty funny themselves instead of interrupting the laughs. But hey, you could have your own favorite from the 3(4) crown princes of comedy and I wouldn't argue too much.
A 10 out of 10.