U2 Clarence rooftop gig 2000

"It’s very hard to imagine anyone else being in the Beatles. It’s very hard to imagine anyone else being in U2. People tell me that if you go to a U2 show, when we walk out on stage, everybody has the hairs going up in the back of their neck. What we don’t tell everyone is that happens to us, too. And I don’t know why that is. I think it’s chemistry." - Bono, 2009