It's no secret that science fiction has paved the way for technology. Sci-fi authors are scientifically-inclined by design and they often introduce the world to concepts that they know will come to fruition at some point down the road. What's always fascinated us, however, are all the things that science fiction has promised that haven't come to fruition. It's just human nature to want what you can't have and books, television shows, and especially movies have introduced us to a host of must-have toys, if only they existed.

These gadgets aren't strictly science fiction, some aren't even "gadgets" per se, and some of them even exist in some form or the other, but everything listed here - mainly from movies, some from television - appeals to the geek in all of us.