Washington, April 26 -- TV host and comedian Jay Leno has regret in his life, and it was his infamous moment with Jimmy Kimmel.

In 2010, Kimmel appeared on Leno's show and called him out for reversing his decision to hand over The Tonight Show to Conan O'Brien, as reported by People.

After ratings for the late-night show and his 10 p.m. talk show, The Jay Leno Show, fell, the comic returned to the old show, while O'Brien refused to move to a later time slot.

After Leno questioned Kimmel about one of the funniest pranks he's ever played during his then appearance on The Tonight Show, the comedian said, "I told a guy that five years from now I'm going to give you my show, and then when the five years came, I gave it to him, and then I to...