“Break a leg!” takes on a whole new meaning for a woefully misguided troupe of players at the Cornley University Society’s opening night performance of The Murder at Haversham Manor. An unconscious leading lady, a corpse who can’t play dead, a ruffled detective, and a word-mangling butler (among others) must battle against technical gaffes, forgotten lines, and sabotaging scenery in a quest to arrive all in one piece at the final curtain call. Part Monty Python, part Sherlock Holmes, all mayhem, this 1920s whodunit is disastrously delightful.