9: Schrödinger's Nyan Cat
This one might be for quantum physics fans only.
10. Cat watches cat watching Nyan cat
Sure, there's the "cat watches nyan cat video", but this guy ups it a notch by having his cat watch THAT video. I'm not sure how many iterations this got ("OK, at least six"), but I'm getting a headache.
Hitler watches Nyan Cat. Because you can always merge your memes if you have to.
Keith Shaw rounds up the best in geek video in his ITworld.tv blog. Follow Keith on Twitter at @shawkeith. For the latest IT news, analysis and how-tos, follow ITworld on Twitter, Facebook, and Google+.