Hungry and wanting food, the Warners accidentally start the French Revolution.

Hungry and wanting food, the Warners accidentally start the French Revolution.

Mo attempts to create a father/son bond with Blair. Dawn and Spencer have a lively dinner with Dawn’s parents. Keith finds his secret increasingly difficult to hide.

At Blair and Tiff’s engagement party, Mo’s feelings for Dawn begin to cloud his judgment. Wayne and Yassir get into serious trouble, while Keith takes a big step.

Sheldon’s search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.

After overhearing that Wil Wheaton is entering a trading-card competition, Sheldon decides to enter it himself. Meanwhile, Penny sets up one of her friends on a date with Wolowitz.

After he’s humiliated on National Public Radio, Sheldon vows to destroy Kripke, while Wolowitz tries not to destroy his new relationship with Bernadette.

Penny gets help from Sheldon in order to understand what Leonard’s work is, while Wolowitz develops a jealousy when Leonard starts hanging out with his new girlfriend.

Leonard is aghast to find out a secret of Penny’s: she believes in psychics. Meanwhile, Sheldon tries to assist Koothrappali in picking up a girl at a university mixer.

Pam’s contractions begin but she and Jim are determined to wait it out as long as possible so they can have more time at the hospital. Meanwhile the rest of…