Their career in cinema only spanned 20 years, but the Marx Bros. packed some mighty durable comedy into it. For me, their films fell neatly into three groupings:
Still Funny Bros.
The Bros. Fail
I think the movie I will probably re-watch first will be At the Circus. In it, you've got your Margaret Dumont, you've got your circus freaks, and you've got a stuffy orchestra being set adrift in the ocean. There ain't much not to love there.