Charlie Chaplin The Circus (1928

At a circus midway, the penniless and hungry Tramp (Chaplin) is mistaken for a condemnable pickpocket and chased by both the police and the real crook (the latter having stashed a stolen wallet and watch in the Tramp's pocket to avoid detection). Running away, the Tramp stumbles into the middle of a performance and unknowingly becomes the hit of the show.
The ringmaster/proprietor of the struggling circus gives him a tryout the next day, but the Tramp fails miserably. However, when the property men quit because they have not been paid, he gets hired on the spot to take their place. Once again, he inadvertently creates comic mayhem during a show. The ringmaster craftily hires him as a poorly paid property man who is always stationed in the performance area of the big top tent so he can unknowingly improvise comic material.