This is one of the first things, if not the first thing, I ever saw on a blog - I thought it was incredible then, and still do now. The first guy is good. The second... well, freakishly talented (along with freaky) is the best way to term it. Enjoy!
EDIT: Thanks to Jew Speak in the comments, who points out an even better video of this guy (apparently named David Elsewhere [?]). Ridiculous.Have a wonderful Shabbos!