A Day at the Races (1937)

One of the greatest comedies of all time, period--and the finest comedic group at their peak, though I slightly prefer Duck Soup. Still, you won't find any better than this. Their hilarity and zaniness of the core trio is spellbinding, and their consistent comedic inventiveness is remarkable. The pacing, utilizing the occasional charming musical passages of both Chico and Harpo, are to provide a necessary counterpoint to the set-pieces, otherwise it would be too much for a cinephile to take in at one sitting.