"Tonight Show" host Jay Leno aired his emotional final late night episode last night, his fellow colleagues expresses their thoughts on Leno legendary run.

 Conan O'Brien only told one joke about his former Tonight Show predecessor and successor yesterday on his TBS late night show.

"The Olympics start airing tonight on NBC. It's very cool. That's right, NBC has the Olympics. It's a big deal," O'Brien said in his opening monologue on TBS' Conan Thursday. "NBC will finally get to show somebody who is OK with passing the torch."

The host of the late night show Conan also added: "I allowed myself one, but it was a good one."

Leno's longtime late night competitor, The Late Show's host David Letterman congratulated Leno on his 22 year run.

"Congratulations on a wonderful run, and I'll tell you something -- If I was Jay Leno and I was retiring? You know what I would do? I'd go out and buy myself a car," said Letterman on his show referring to Leno's passion for buying classic cars.

Like Letterman, Jimmy Kimmel puts his past disagreements with Leno aside and expresses his thoughts.

"Issues aside, 20 years at #1 is a remarkable achievement. Congratulations and best wishes to @jayleno on an incredible run," tweeted Kimmel via Twitter last night.

The iconic late night show was once hosted by iconic comedians: Steve Allen, Jack Paar and Johnny Carson prior Leno's Tonight debut in 1992.

Leno's Tonight Show successor Jimmy Fallon express his thoughts

"To Jay, we say thank you very much. He's been a great guy. We're going to miss him," said Fallon during his Late Night show monologue last night adding: "The ratings have been so good this last week because it's his last week that NBC is going to extend his week - so we're going to have another week of saying goodbye to Jay Leno."

Leno revealed his thoughts on Fallon succeeding him on February 17 on NBC in a recent NY Times article, when the show returns to New York for the first time since 1972.

 It's fun to kind of be the old guy and sit back here and see where the next generation takes this great institution," said Leno to NY Times regarding Jimmy Fallon replacing him on the Tonight Show adding. "But it really is time to go and hand it off to the next guy, it really is."