The Maternal Congruence is the 11th episode from the third season of the CBS sitcom The Big Bang Theory, and the series' second Christmas-themed episode. It aired on December 14, 2009.
The Maternal Congruence is the 11th episode from the third season of the CBS sitcom The Big Bang Theory, and the series' second Christmas-themed episode. It aired on December 14, 2009.
Leonard's mother, Dr. Beverly Hofstadter, has a return visit for Christmas and Leonard didn't tell her he was going out with Penny. Leonard is surprised when she comes because she told Sheldon something she didn't tell Leonard (like she didn't tell him Mitzy, his dog died). Then Beverly gets drunk and kisses Sheldon on the lips.