Matt Damon couldn’t help crashing his long-time “rival” Jimmy Kimmel ‘s last show in Brooklyn .

The 54-year-old actor snuck onto the set of the 57-year-old host’s show dressed as New York education’s new furry green mascot, Frankie Focus —implemented to help enforce the state’s new bell-to-bell school cell phone ban.

Jimmy had just finished roasting the mascot in his opening monologue when he revealed a “special guest” who turned out to be Frankie himself! Things took a turn when the costumed man became hostile and Jimmy suspected something was amiss. He demanded his guest to remove the head of his costume, revealing his long-time rival Matt Damon beneath.

“I know we’ve had our differences over the years, but I wanted to be here tonight for your last show ever,” Matt

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