Three Pests in a Mess is the 83rd short subject starring the Three Stooges.
The Stooges are inventors desperately trying to obtain a patent for their fly catching invention. Whilst learning they must catch 100,000 flies to get their patent, their conversation is overheard by several crooks across the hallway. Unfortunately, the crooks think Curly has $100,000. A flirtatious woman (Christine McIntyre) who is part of the nest of crooks corners the gullible Curly and tries to finagle the non-existent money out of him. When he confesses that the 100,000 are indeed flies and not dollars, she turns against him, and has the crooks go after the Stooges.
The trio take cover in a sporting goods store where Curly accidentally shoots a mannequin. In their infinite wisdom, the Stooges believe they have killed a real human, and go about trying to bury the "body" in a nearby pet cemetery. Unfortunately, the cemetery's night watchman (Snub Pollard) sees the Stooges prowling around and informs cemetery owner Philip Black (Vernon Dent), who happens to be attending a masquerade party with his partners. The owner arrives at the cemetery, replete in the spookiest outfits possible, and scare the bejesus out of the Stooges.