David Letterman and Jimmy KimmelIf you don't know by now that David Letterman and Jimmy Kimmel aren't the biggest Jay Leno fans, last night's episode of the 'Late Show' should be a clue.

"I can't tell you how much I enjoyed your participation in the Jay Leno scandal," Letterman told his guest Kimmel, referring to the time Jimmy appeared on 'The Jay Leno Show' and bashed its host repeatedly, as well as the time he did his own show dressed as Leno.

"I've known Jay for a long, long time and it just got to be a lot of fun," David added of the pleasure he took in needling the 'Tonight Show' star.

"I would like to keep it going, you had him, we were drowning him, and you threw a lifesaver out during the Super Bowl," Kimmel shot back.