U2 & Green Day video

I'm a big U2 fan, I don't think that's any secret. I also quite liked Green Day's last album, as well as Dookie way back in high school. Still the idea of them teaming up for a song seems a bit odd, given that they're from different generations and stylistically don't really have much in common. It happened though on the song "The Saints Are Coming". Here is the video: