While appearing on “The Jay Leno Show” in 2010, Kimmel repeatedly took shots at Leno over the notorious “Tonight Show” debacle involving Conan O’Brien.

Jay Leno recalled the incident that sparked his feud with Jimmy Kimmel. (Getty) He continued, "It was my mistake, I trusted somebody. I went, ‘Ah, I made a mistake. OK, I should pay the price.’ ...