It doesn't have the raw sentiment of CITY LIGHTS or the social relevance of either MODERN TIMES or THE GREAT DICTATOR, but for pure laugh-out-loud moments, THE CIRCUS is probably Chaplin's finest straight-ahead comedy.
The plot is fairly straightforward -- Tramp joins circus, falls in love, tries to vanquish a rival suitor, then (in an ending of typical Chaplinian pathos) arranges for the rival suitor to get the girl. However, Chaplin packs the story with enough gags, extended jokes, and visual tricks to keep the film moving at a frenetic pace, even in its moments of sweetness.
The setting of the circus naturally lends itself to plenty of comic elements, and Chaplin makes the most of them in some unexpected ways. For example, there's the expected Locked In The Cage with The Sleeping Lion joke (which has subsequently and successfully been played to the hilt in Bugs Bunny cartoons), but Chaplin gives it a graceful twist with the addition of a pan of water that'll have you on the edge of your seat as he tries frantically not to drop it.
But Chaplin doesn't just use the circus to showcase gags -- he also uses the trappings to advance some extended and complicated jokes. The opening moments of the film, for example, feature the Tramp being mistaken for a pickpocket. After a full-out chase, the Tramp, the real pickpocket, and a policeman finally end up in a funhouse, complete with animated figures and a hall of mirrors. At this point, there are two wonderful visual jokes -- the first involves the Tramp's inability to pick up a dropped hat in a hall of mirrors(in what must have been an excrutiatingly technical shot to avoid reflecting the camera.) Chaplin, ever the perfectionist, executes the scene brilliantly. The second joke -- and the one which gets the biggest belly laughs -- involves the Tramp and the hapless pickpocket pretending to be animated figures to avoid being nabbed by the policeman. When Chaplin conks the crook over the head with his own cosh, then rotates mechanically to laugh giddily . . . well, there's hardly a funnier moment in film. Suffice it to say, the crook is caught, but only after ten minutes of gags to neatly bring the extended Mistaken Identity Joke to a neat end.
Chaplin also plays out a jaw-dropping tightrope walking scene (and remember while watching that Chaplin actually taught himself to walk a tightrope for the film -- there are no stuntmen involved) which becomes all the more entertaining through the addition of some uncooperative monkeys. The impromptu results are funnier than anyone could have scripted.
While the film stays free of social commentary, there is one telling bit of artistic elbow-nudging at one point in the film, when the Tramp, who has been hired as a clown, is lectured by the crabby Ringmaster on How To Be Funny. When the Tramp participates in the hackneyed skits himself, things go wrong from the start, making the skits funnier than imagined, but remarkably UNfunny to the know-it-all Ringmaster. The message is a subtle, but clear one on Chaplin's part -- don't tell ME what's funny; let me show YOU what's funny.
While MODERN TIMES and CITY LIGHTS are the more effective films in terms of storytelling and blending humor and pathos, THE CIRCUS stands as Chaplin's funniest film in terms of successfully executed gags, jaw dropping visuals (including a remarkably advanced dream sequence), and some fall-over-laughing moments. This is the film I show to my friends who have never seen a Chaplin film (apart from some highlighted moments from MODERN TIMES or CITY LIGHTS) to give them an idea of Chaplin's talent. While it has sometimes (though rarely) failed to elicit a "Wow!", it has never failed to generate a room full of laughter -- the true testimony to Chaplin's art.