"It's not easy for me to stand up in front of 50.000 people. It's not my natural habitat. I think it's probably easy for Bono. But I can do it. And I will do it if I know the songs are great."
- Adam Clayton, 2009
The counting Bono does in the beginning of Vertigo is "uno, dos, tres, catorce", which is Spanish for one, two, three, fourteen.