Jack Antonoff likes to have himself a good time. After all, why else would he name his band fun., right? Recently, his biggest source of enjoyment has come from working with his new side project, Bleachers, which dropped its debut album this year. But even more fun than that was his recent collaboration with one of the U.K.’s hottest young artists, Charli XCX. As part of the new program “In-Ride Sessions,” presented by Kia, the two paired up for a remix/mashup, with Antonoff covering Charli XCX’s hit single “Break the Rules,” and Charlie putting her spin on Bleacher’s recent track “Rollercoaster.” The results are pretty incredible, as you’ll see in the video above. (Warning: This video does contain graphic neon.)