During a segment of "Jimmy Kimmel Live!" the late night host's sidekick Guillermo crashed a fake junket for Damon's upcoming Sony flick "Elysium."
Guillermo storms in saying he's promoting a "new film" called "Estupido," a true story about "a man from Boston who's stupid" before showcasing another fake film featuring the star.
The entire fake feud started as a joke years ago when Kimmel sent fake apologies to the actor for not having enough time to interview him.
Hopefully, Damon will exact revenge by taking over the show again.