Jimmy Kimmel put "issues aside" and congratulated Jay Leno in a tweet on Thursday, Feb. 6, just before Leno's final episode as host of "The Tonight Show" was set to air.
"Issues aside, 20 years at #1 is a remarkable achievement," Kimmel wrote in his tweet. "Congratulations and best wishes to @jayleno on an incredible run."
Kimmel has had a few "issues" with Leno over the years. In a Rolling Stone (Warning: article contains expletives) interview in 2013, Kimmel said Leno had not "been a good stand-up in 20 years." The writer of the article also called Kimmel a "card-carrying member of the Hate Jay Club."
He also took the opportunity to mock Leno when he impersonated Leno on "Jimmy Kimmel Live" in 2010. It was at the height of the drama between Leno and Conan O'Brien.
O'Brien initially took over "The Tonight Show' in 2009, but O'Brien exited the show in 2010 after a dispute with NBC over a proposed time slot change that would move Leno's then primetime show in the 11:35 p.m. time slot that "The Tonight Show" occupied for years.
Another time Kimmel verbally jabbed Leno occurred when Kimmel appeared on Leno's primetime show in a Q&A style interview.
At one point, Leno asked Kimmel, "Ever order anything off the TV?"
Kimmel replied, "Like NBC ordered your show off the TV?"
Kimmel's not the only person who has a feud with Leno. David Letterman and Leno have had their own feud going back as far as when Leno was named the permanent host of "The Tonight Show" over Letterman in 1992. Howard Stern also often criticizes Leno.
Not everyone is anti-Leno. Sandra Bullock was emotional during her appearance on "The Tonight Show" on Wednesday night when she was saying goodbye to the comedian and reminisced with him about all of her appearances on his show.