Chance The Rapper joined Panic! At the Disco on stage last night at UC Riverside’s Heat Music Festival, where they were both on the bill for the night. He didn’t hop on the mic, but he did get up on stage with his posse to jump around and sing along to “I Write Sins Not Tragedies,” the once-inescapable hit single from the band’s criminally underrated debut album A Fever You Can’t Sweat Out, which just so happens to be celebrating its 10th anniversary later this year. Watch the video below — everyone looks like they’re having a lot of fun.

[Photo via Instagram.]