Strongest Man in the World, The (1975)

Medfield College science major Dexter Riley and his classmates have been working on a new vitamin compound when a lab accident creates a supercharged mix that ends up in Dexter's cereal bowl. Dexter is transformed, possessing a temporary, superhuman strength that levels lampposts and destroys doorknobs. The powerful formula comes to the attention of the college dean and two rival cereal companies, touching off a hilarious chain of events.