The Big Bang Theory Season 4 Episode 14
The Thespian Catalyst
After reading scathingly critical tweets from his students, Amy suggests Sheldon enlist the help of an acting coach, sending him off to Penny's door asking for her to take the role.
Sheldon mocks and resists Penny at every turn, causing her to give in to his request to act out a one act play he wrote "Where No Sheldon Has Gone Before." Penny forces Sheldon to reluctantly play the part of his mother, while she plays Spock, sending Sheldon into a tizzy after he, as his mother, confronts his younger self.
Meanwhile, after Bernadette calls Raj a "hottie," he has fantasy's of taking over Howard's responsibilities of satisfying Bernadette sexually, leading to a Bollywood-inspired dance number.