Watch Three Pests in a Mess (1945) Official Trailer

The stooges are three inventors trying to a get a patent on their preposterous fly catching invention. When they learn they'll have to catch 100,000 flies to earn enough to get a patent, some crooks overhear and think the boys are the $100,000 sweepstakes winners. When the crooks give chase, the stooges hide in a sporting goods store where Curly shoots a dummy, which they mistake for a real person. The boys decide to bury the "body" in a pet cemetery, but the cemetery owner arrives from a costume party with his partners, all dressed as spooks, and they proceed to scare the devil out of the stooges.