A gangster drinks a serum that will allow him to live forever and goes to hide out in the bayou where he falls into a pit of quicksand.; After one joke too many, a man cuts off his practical-joking brother's head.; A diver kills an old man for his map of a sunken freighter loaded with gold and then gets his air hose snagged by the corpse, which he earlier threw into the water.; A spinster gets a valentine sent by a co-worker as a prank and winds up in seventh heaven.