Homer Simpson appeared with Jay Leno on The Tonight Show to promote 'The Simpsons Movie.' Business Wire/File
NBC show host Jimmy Fallon, dressed as a mom (l.), danced with first lady Michelle Obama during an episode of 'Late Night with Jimmy Fallon,' on Feb. 22, 2013, in New York. Mrs. Obama returned to the show to promote her 'Let's Move' campaign and to perform in a skit called 'Evolution of Mom Dancing.' Lloyd Bishop/NBC/AP/File
New Jersey Gov. Chris Christie (l.) chats with David Letterman (r.) during his first visit to CBS’ 'Late Show with David Letterman,' on Feb. 4, 2013, in New York. Jeffrey Neira/CBS/AP/File
Conan O'Brien tries on ancient-style war gear to the amusement of Brad Pitt (l.) in New York on a segment of NBC's 'Late Night with Conan O'Brien' in 2004. Mr. Pitt was promoting his movie 'Troy.' Dana Edelson/NBC/AP/File
Actor Matt Damon, who's been the butt of a long-running joke on Jimmy Kimmel's ABC talk show, took over the program on Jan. 24, 2013, and left a bound and gagged Mr. Kimmel to watch a succession of stars stop by. ABC/AP/File
Texas Governor and Republican presidential candidate George W. Bush gives the 'W' sign (that stands for his middle initial) as he wears an Al Gore Halloween mask while host Jay Leno wears a George W. Bush mask during taping for Leno's show in Burbank, Calif., October 30, 2000. Rick Wilking/Reuters/File
David Letterman reaches to squeeze Cher's knees during taping of the 'Late Show with David Letterman' in New York, on Nov. 18, 1998. Alan Singer/CBS/AP/File
Johnny Carson as 'Carnac the Magnificent' on the 'Tonight Show.' UPI/File
David Letterman (l.) and Jon Stewart appear on stage at Comedy Central's 'Night Of Too Many Stars: An Overbooked Concert For Autism Education' at the Beacon Theatre in New York, Oct. 2, 2010. Charles Sykes/AP/File
Jay Leno leaving: NBC's hand was forced, to its perspective, by ABC when that network put Jimmy Kimmel in the time slot shared by Leno and CBS' David Letterman earlier this year.
David Bauder, Associated Press /
April 4, 2013
NBC's recent personnel transition in morning television was a disaster. Executives hope their luck is better late at night, and they have a year to try and make it a smooth handoff from Jay Leno to Jimmy Fallon at the "Tonight" show.