The star of the film Elf, Will Ferrell, returns to Billy on the Street for a very special holiday lightning round! Watch how New Yorkers react when Will and Billy demand holiday cheer!

Talk show host Jimmy Kimmel talks to children about their expectations for the holidays and whether they have behaved themselves.

Santa has his hands full right now, so talk show host Jimmy Kimmel is helping him figure out which children belong on the naughty list by hooking them up to a fake lie detector.

To help prepare the First Lady for life after the White House, Ellen took her to CVS Pharmacy to pick up a few things.

Alan gets very nervous when Charlie shows an interest in the receptionist at his practice.

The male characters of the hit TV series How I Met Your Mother are constantly helping each other get into and out of situations. The book Bro on the Go contains the code of honor necessary for maintaining such friendships.

Mickey and Donald struggle to help Goofy get through a job interview.

It was only a matter of time: Homer finds himself face to face with Donald Trump's lustrous blonde hair, leading to much introspection about his own baldness.

American adult animated sitcom "Family Guy" has been nominated for and won many awards. In this scene, Peter brings home an unexpected new pet for the family.

From time to time, we give celebrities a chance to read some of the mean things people tweet about them. We extended that same offer to our Commander in Chief, who happily agreed. This is an all President Obama edition of #MeanTweets.

Barney never fails to impress the group with the lengths he'll go in order to get a woman interested in him.

In this week's Lightning Round, Neil Patrick Harris and Billy Eichner take to the streets to find out how New Yorkers feel about the end of the series How I Met Your Mother.

Jimmy Fallon can't believe he's at the White House on the Fourth of July. Watch part of his stand-up performance from that evening in which he does impressions of ten other comedians!

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.