"Scrambled Brains" (1951)

Shemp has been a very sick man, suffering from hallucinations, and has been in a sanitarium, but it gets too expensive for Moe and Larry to keep him there, so they bring him home. When they go to bring Shemp home, they learn that he's marrying his "beautiful" nurse, Nora (who is downright homely!) At Nora's apartment building, they have a run in with a stranger who is carrying groceries. They get the better of him, and he vows to get revenge if he ever sees them again. The day of the wedding, they discover that the stranger is Nora's father, and all hell breaks loose!