Sometimes, off-Broadway producers get a little, well, ambitious, and the musical comedy The Big Bang! follows two such fellows. In this case, the duo aims to create an epic extravaganza spanning the history of the world from the big bang to the present. The budget is $83.5 million; the cast numbers 318; the costumes exceed 6,000; the runtime is 12 hours; and the audience is in for a hilarious farce that includes guest spots by