If you're like me, you're not a regular viewer of Jimmy Kimmel Live. So let me get you caught up on "the feud."
Apparently, when the show first began airing, and they were struggling to get marquee guests, Kimmel had a running joke where he would end most shows saying "My apologies to Matt Damon, but we're out of time." No rhyme or reason why Matt, it just worked.
Eventually, as the show picked up steam, this encounter happened:
And yes, that was staged, Matt was in on it.
Then, last summer, before Bourne Ultimatum came out, there was this spot on Kimmel's show:
Finally, just this week, Matt got his revenge, with the help of Kimmel's girlfriend Sarah Silverman: