For the hundreds of people crammed into the center of Times Square on a cold Monday evening, it must have seemed like a surreal dream inspired by a night gorging on junk food, Born to Run and The Joshua Tree.
U2's The Edge, Adam Clayton and Larry Mullen Jr. played the familiar starting notes of Where the Streets Have No Name.
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Instead, out walked Bruce Springsteen in a leather jacket.
Needless to say, the crowd - which didn't pay a dime for the concert or have any clue it was even happening until about 2:30 this afternoon - went into complete hysterics.
It was an amazing moment at a World AIDS Day (RED) benefit that came together in complete secrecy over the past couple of weeks.
Originally scheduled as a regular U2 concert meant to follow their planned week-long Jimmy Fallon residency, the band had to start working the phones after Bono's devastating bike injury left him unable to perform.
Finally, Chris Martin and Bruce Springsteen agreed to front U2 for the evening, joining Kanye West and Carrie Underwood on the bill.
Despite everything that goes into assembling a free outdoor performance in the heart of New York City, word of the gig didn't reach the public until the band announced it on their website about five hours before the showtime.