"Three Hams on Rye"(1950)

The Stooges are small-time actors and stage hands. They're told by by their boss to keep out a notorious drama critic who has been trashing the company's shows. The Stooges disguise themselves so well that Moe and Shemp mistake Larry for the critic, and they whale the tar out of him before discovering their mistake, the critic enters in the meantime. When an errant potholder is accidentally cooked into a cake for the play's climatic scene, the chaos turns the melodrama into a comedy hit!