I learned today what people call a mash-up. You need some gifted geek with a decent collection of movies and a good musical culture. And then you mix eveything in a new and original video clip. Here are two mash-ups one with Radiohead, the other with Arcade Fire. It was fun to see in the comments of the Arcade Fire clip that several visitors did not recognize the original movie : probably a hint telling me that most of the web-skaters are definetely less than 30.