Did anyone else try to build one of these after seeing "Back to the Future" as a kid? I remember being 10 years old and trying to strap fans upside down to my skateboard. And then of course there is always, "If the earth was a giant metal ball, then we could strap magnets to the bottom!" Which, actually, the latter is true, if you were somehow able to get your hands on some superconducting elements (and able to cool them sufficiently so they began to exhibit superconductive properties).