Bernadette and Howard attempt to leave the kids at home on The Big Bang Theory finale. "The Stockholm Syndrome" is the 24th episode of the show's 12th season.
Leonard learns the truth about why his mother came to visit on The Big Bang Theory. "The Maternal Conclusion" is the 22nd episode of the show's 12th season.
With Wolowitz in charge, Sheldon and the gang experiment on the kids on The Big Bang Theory. "The Conference Valuation" is the 17th episode of the show's 12th season.
Amy and Sheldon are devastated by what they read in a Russian newspaper on The Big Bang Theory. "The Citation Negation" is the ninth episode of the show's 12th season.
Sheldon: I'll have a diet Coke. Penny: Can you please order a cocktail? I need to practice mixing drinks. Sheldon: Fine... I'll have a virgin Cuba Libre. Penny: That's... rum and Coke without the rum. Sheldon: Yes, and would you make it diet?