Imagine theater’s longest-running show ever, Agatha Christie’s “The Mousetrap,” turned inside out and upside down into a nonstop laugh riot of bumbling incompetence by a hapless yet determined amateur troupe known for choosing their plays based on their member numbers. But even then things don’t exactly work out. Earlier Cornley Polytechnic Drama Society productions came with revised titles such as “Two Sisters,” “The Lion and the Wardrobe,” “Cat,” and “James and the Peach.”