If Bono left, we could carry on. If I left, we'd be screwed.

The big issue with rock stars becoming actors is that sometimes it's not believable, and vice versa with actors becoming rock stars. Sometimes just doesn't fit.

We all have views on what our Irishness means to us. Two members of the band were born in England and were raised in the Protestant faith. Bono's mother was Protestant and his father was Catholic. I was brought up Catholic. U2 are a living example of the kind of unity of faith and tradition that is possible in Northern Ireland.

I don't think anybody could imagine the life that I've been lucky enough to have. It's been an incredible journey.

And if I had to spend 20 years in the band just to play that show, I think it would have been worthwhile.

I've often thought that it would be great to do some acting because nobody would think that I would be able to do it and it scares the living hell out of me.

I will never be a career actor, I don't think. I don't feel that I have the skill set to jump into it that way, although I wouldn't mind giving it a try.