Rent Ernest Rides Again (1993)

Working as a janitor for a small-town university might seem like a dead-end job to some, but Indiana Jones has nothing on Ernest, at least in his fantasies. Ernest is about the only person around who believes the out-to-lunch theory of college history professor Dr. Abner Melan (Ron James), that the real Crown Jewels of England are actually hidden in a giant cannon, called "Goliath". Why even the wishy-washy professor himself doesn't quite believe it until Ernest hijacks his henpecked friend and the action explodes like a cannonball in... Ernest Rides Again.