Jimmy Fallon and Cameron Diaz Do a Talk Show Using 'Other Voices' (VIDEO)

In a sketch that looked like it was ripped right out of 'Whose Line Is It Anyway?' or the more recent 'Drew Carey's Improv-a-Ganza,' Jimmy Fallon and Cameron Diaz participated in an interview on 'Late Night' (Weeknights, 12:37AM ET on NBC) where neither of them could talk. Instead, someone off-stage was on hand to provide all of their words. They simply had to play along with what was being said, which proved more difficult as the sketch went along and the lines got more and more ridiculous. Fallon is always pretty good for cracking up anyway, but we can't blame him for losing it as many times as his "voice" was having him reach into his pocket to get a gift for Diaz. Each time, though, the object in his pocket was determined to not be a roll of dimes, a AAA battery or a Tootsie Roll.

Keith Olbermann to Fallon: 'Almost All of the Other News Broadcasts in This Country Suck' (Video)

Keith Olbermann is blitzkrieging talk-show couches to promote his new Current TV offering, which debuts June 20. On Thursday, he stopped by "Late Night with Jimmy Fallon." Fallon asked the former MSNBC host to look into the camera and tell the home audience why they should tune into "Countdown with Keith Olbermann" on Monday at 8 p.m. ET. Olbermann's answer: "Almost all of the other news broadcasts in this country suck." Read More...

Betty White and Jimmy Fallon Play 'Password' on 'Late Night' (VIDEO)

Betty White took a stroll down Memory Lane on 'Late Night With Jimmy Fallon' (Weeknights, 12:37AM ET on NBC). The veteran actress took on host Jimmy Fallon in a game of 'Password.' White was a frequent guest on the original 'Password' network TV game show, which aired in the '60s and '70s. In fact, White's involvement in the show went further than just guest-starring on it: She married "the man in the middle," Allen Ludden. 'Password' host Ludden became White's third husband in 1963 and they remained together until his death in 1981. In fact, in a touching moment, White told Fallon that her appearance on his version of 'Password' marked what would have been her and Ludden's 48th wedding anniversary. So, after a such a lovely story you'd have thought that Fallon would let her win, wouldn't you?

Simon Pegg Tells Fallon That Steven Spielberg Beat Him Up (VIDEO)

Simon Pegg stopped by 'Late Night With Jimmy Fallon' (Weeknights, 12:37AM ET on NBC) to talk about his new movie, 'The Adventures of Tintin.' To get the look of the original 'Tintin' comic books, director Steven Spielberg shot the movie using motion-capture computer animation. This meant that Pegg and his B.F.F. Nick Frost -- who play the identical Thompson Twins -- both had to wear really tight-fitting suits. The sight was "not that pretty," according to Pegg. However, tight suits aside, the most exciting part of the shoot for sci-fi fanatic Pegg was getting to grips with his idol Spielberg and co-star Andy Serkis. Literally. When Spielberg was explaining to Serkis how to rough up Pegg's character he grabbed Pegg and started shaking him around. Then Serkis joined in and started shaking him.

Kirstie Alley Shows Jimmy Fallon a Sexy Cha Cha (VIDEO)

Kirstie Alley may not have won the mirrorball trophy on 'Dancing With the Stars,' but she's still Jimmy Fallon's favorite. Alley stopped by 'Late Night' (weekdays, 12:35AM on NBC) and Fallon proclaimed her the "Clay Aiken" of 'Dancing With the Stars.' "You were the fan favorite," Fallon said. "You were the real winner." Still working her 'DWTS' moves, Alley got Fallon up from behind the desk to teach the talk show host how to cha cha.

Glenn Close Sumo Wrestles Jimmy Fallon on 'Late Night' (VIDEO)

If you had a show and were going to have an actor of the caliber of Glenn Close on, what would you do? If you answered "dress her up in an oversized sumo costume and fight her," then you're probably Jimmy Fallon. And yet, it's hilarious to see these crazy things all the time on 'Late Night' (Weeknights, 12:37AM ET on NBC). In many ways, Fallon has created one of the most unpredictable shows on television. If you'd have told us we'd be on the edge of our seats during a sumo wrestling match between Fallon and Close a week ago, we wouldn't have believed you. Even better was after the match when neither of them could get up without assistance. It wasn't as sophisticated a victorious moment for Close as her Emmy wins, as she had to celebrate this win flat on her back, rolling a bit from side to side. But the whole thing was certainly entertaining.

Kathie Lee Gifford Beats Jimmy Fallon at Wine Pong, Then Kisses Him (VIDEO)

For the record, Jimmy Fallon should have known better. You can't beat Kathie Lee Gifford at anything that involves wine. Nevertheless, he challenged her to a game of Wine Pong on 'Late Night' (Weeknights, 12:37AM ET on NBC). Even her 'Today' co-host Hoda Kotb can't touch her when it comes to drinking and crazy shenanigans, so it was no surprise that Gifford was nailing every shot, leaving Fallon to down the cups of wine. He was even wrong when he claimed you can't chug chardonnay, as Gifford did just that. And when she won, she took her prize. A prize of her own choosing, apparently, as she grabbed Fallon and said, "Hoda's gonna be so proud of me," before planting a lengthy kiss on him.

Jon Stewart Threatened Jimmy Fallon When Fallon First Got 'Late Night' (VIDEO)

By now, Jimmy Fallon has established 'Late Night' as a cool place for fun and good times, but he wasn't always so confident and sure of himself. But, as was revealed on 'The Daily Show' (Weeknights, 11PM ET on Comedy Central), Jon Stewart may not be the best person to talk to when you're feeling that way. Fallon said that on the first day of 'Late Night,' Stewart was the only one who called him about it. But it wasn't to congratulate him, or to wish him luck. Stewart said, "Don't think you can come after me, kid." And, according to Stewart now, he even added, "I will destroy you."

EXCLUSIVE: See Jimmy Fallon as Universal Studios New Tour Host (VIDEO)

Hosting 'Late Night' in New York City keeps Jimmy Fallon pretty busy, but not too busy for his new gig: hosting hourly tours at Universal Studios in Hollywood. Wait, what? Yes, through the magic of technology -- really just a nice camera and some HD TV screens on the trams -- Fallon is now the new video host of the world-famous tour. "We really had fun with filming my role. We brought some writers out from our show and added some jokes, more play with the Studio Tour guides, the tram drivers and we added a song or two," Fallon said. "The tour itself is a classic, a really great experience. For anyone with any interest in show business, it's all there: the glamor, the glitz, all the hard work that goes into making a movie or a TV show can be experienced on the Universal Studios Hollywood Studio Tour. I'm very happy to be a part of it."

Jimmy Fallon, David Crosby And Graham Nash Rocks Miley Cyrus During Neil Young Impression (Video)

Jimmy Fallon strapped on his guitar and partied in the U.S.A during his latest Neil Young impression.