The Strokes co-headlined this weekend's Reading festival with the recently reunited Pulp, and there was a a pretty cool collaboration between the bands: Jarvis Cocker joined The Strokes onstage to cover the Cars' "Just What I Needed" in a pretty perfect performance. Cocker and Julian Casablancas traded verses, and hugged each other a lot, and generally had a fun time. You don't see Casablancas come unglued like this, like ever. Watch it above.