Matt Damon snuck onto Jimmy Kimmel Live! on Friday, escalating his faux-feud with ABC late-night host Jimmy Kimmel as the latter taped the last of five shows in New York City.

The Oscar winner entered the stage of the Brooklyn Academy of Music’s Howard Gilman Opera House incognito, dressed as Frankie Focus, New York State’s new mascot promoting restrictions on smartphones in classrooms. In his monologue, Kimmel described Frankie as a “neon Chewbacca with glasses on” and a “giant florescent monster.”

Then Kimmel invited Frankie on stage, and the mascot immediately started ragging on him, saying he could tell the comedian didn’t get a college degree from watching his “stupid” monologue. “Hiya, everybody! Isn’t he dumb?” Frankie asked the live audience.

Kimmel said he wasn’t going t

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