During Chromeo’s set at Governors Ball yesterday, Dave 1 announced “There’s this guitar riff I like to play sometimes, it’s like…” and played the unmistakable opening of Vampire Weekend’s “Cape Cod Kwassa Kwassa.” After Dave played the riff once more, Ezra Koenig walked onto the stage, jokingly teasing, “Dave, I showed you the riff, man. It’s really not that hard” before launching into the song in earnest. The brief rendition of the Vampire Weekend track finished up with a slightly modified “It just feels so unnatural/ Here with Chromeo” line, which then immediately led into a performance of Chromeo’s own “Bonafied Lovin (Tough Guys).” Watch fan footage of the surprise onstage collab below.