The Honda Cog commercial [1] (via Ceejbot [2]) is simply stunning; a real-life Rube Goldberg contraption [3] using parts from the new Honda Accord in an incredible display. I can't even begin to describe it and there's some confusion on how it was filmed [4], but in any case, weather it took 606 attempts for a perfect run, or filmed in two halves and spliced together, it is still an impressive feat of filming.
[1] http://home.attbi.com/~bernhard36/honda-ad.html
[2] http://www.ceejbot.com:8669/blog/space/2003-04-15#A_Honda_ad
[3] http://www.rube-goldberg.com/html/gallery.htm