Out of the many guests [1] on David Letterman [2]'s final Late Show, one highly anticipated cameo didn't end up happening. Jay Leno [3], who we all speculated might turn up to end their long-standing late-night feud, did not make an appearance. In a new interview with Adweek, Leno finally disclosed what happened [4]. "Well, I asked Dave to do a 10-second tape for us [when I left]," Leno explained. "Anything, just, 'Leno who?' They said no, they didn't want to do it. Well, why am I going to run all the way to New York? I mean, quid pro quo. I just said, 'No, that's kind of silly.'"

There you have it! These two grown men will be feuding until the end of time.