Arcade Fire’s Win Butler and Regine Chassagne made a surprise appearance onstage during the Bruce Springsteen concert in Ottawa last night. Thankfully, some very lucky fans caught video of them performing The Boss’ own “State Trooper” and Arcade Fire’s “Keep the Car Running.” All I can say is I would’ve probably been reacting much like the excited crowd you can hear in the live videos. Check them out over at Spin.

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