Christie and Letterman share a donut

In this photo released by CBS Broadcasting, New Jersey Gov. Chris Christie, left, and late night host David Letterman, right, react with laughter during the Governor's first visit to CBS’ “Late Show with David Letterman,” on Monday, Feb. 4, 2013 in New York. (AP Photo/CBS Broadcasting, Jeffrey Neira)

David Letterman once altered video to make it look as if Christie was preparing a turkey in the middle of an MSNBC interview. He has depicted the gov struggling to get out of a chair during an Oprah interview.

Letterman once even devoted an entire Top 10 list to Christie fat jokes: What if Christie was president? "Instead of Iraq, we'd invade IHOP." And: "The cabinet now has a Secretary of Cake." 

Tonight at 11:35 pm on CBS, the gov gets payback -- although he mostly ends up just showing off what a good sport he can be.

It's Christie's first-ever appearance on Letterman's show, and according to highlights released so far Christie will open by pulling a (real) donut out of his pocket and taking a bite. 

“I didn't know this [interview] was going to be this long," Christie says by way of explanation. Later, Letterman will take a bite out of the same donut.

Christie comes on stage to Bruce Springsteen's "Thunder Road," according to a transcript of today's taping, and he apparently displays the same kind of good-natured acceptance of the repeated Letterman fat jokes that he has shown before (see the video from 2011, below). 

"From my perspective, if the joke is funny, I laugh, even if it’s about me. If it’s not funny, I don’t laugh," Christie tells Letterman. "But I’ve never felt like it was, you know, anything that really bugged me all that much, no.”

Christie then says 40 percent of Letterman's fat jokes about him are funny, and he even reads a couple of his faves. This classic Letterman line, however, wasn't one of them: "Republicans are having trouble luring Gov. Chris Christie into the presidential race. They should try pie."