Penny invents a quiz to find out whether Sheldon or Leonard is smarter, which only reveals that both of them are completely uninformed about popular culture with the exception of Star Trek.

When Penny returns from visiting her family in Nebraska, Leonard is happy to see her. Sheldon, however, is much less welcoming when he learns that her family has the flu.

Leonard finally tells Penny how Sheldon saved his life and broke the elevator at the same time.

American adult animated sitcom "Family Guy" has been nominated for and won many awards. It continues to air new episodes, going on its fourteenth season.

Howard takes a moment in the tub to fantasize that Katee Sackhoff from Battlestar Galactica is in the tub with him. As it turns out, she has some advice for him.

When Penny dislocates her shoulder, Sheldon brings her home from the hospital and tucks her into bed.

After Marshall and Barney have an argument, Robin and Lily try to figure out what type of alcohol will get them in the right mood to reconcile.

Penny tries to patch things up between Leonard and Sheldon when they are having a fight, but ends up making things worse!

Barney explains the magic of February thirteenth, or as he calls it, "Desperation Day."

The boys decide to go to Long Beach in order to keep lying to Penny.

The kids try to catch snowflakes on their tongues, and Linus once again proves to be wise beyond his years.

In a passionate monologue, Linus explains what Christmas is really all about.

Leonard daydreams about saving Penny and her falling for him.

At the beginning of the classic animation A Charlie Brown Christmas, directed by Bill Melendez and based on Charles Schulz's comic strip, Charlie Brown is having doubts about the holiday season.

While Sheldon struggles with his take-out order, Leonard bids on what he thinks is a miniature time machine.