The music board on 4chan has been remixing classic album covers with the tv show Adventure Time. It's insane. Seriously. This is only a third of what they've done.
Students in a science lab at Imperial College, London, use lab equipment to cover the White Stripes' "Seven Nation Army." They adjusted some of the raw sound in production and added some string instrumentals, but otherwise it's just a group of dudes making music out of machinery and tubing.