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.
Penny: What actor holds the record for being named People magazine's Sexiest Man Alive? Sheldon: William Shatner! Leonard: I don't think it's Shatner. Sheldon: Then it's got to be Patrick Stewart
Penny: I always tear up when the Grinch's heart grows three sizes. Sheldon: Tears seem appropriate. Enlargement of the heart muscle, or hypertrophic cardiomyopathy, is a serious disease which can lead to congestive heart failure.