Acid Pies are weapons used by Klowns to kill people. They are pies filled with a highly corrosive acid. The Klowns threw the pies on the security guard at the amustment park where they had moved The Big Top from the forest. When they killed him with pies, Shorty left a basketball-sized cherry on top of him, with the hapless human melted to the bone. In the final scene of the film, after the ship blew up, some non-acid pies fell on Debbie, Mike and Hansen.