Like toppling dominoes or Mouse Trap, but not: The Cog

Karen forwarded this to me, and it's just one of those things you pass along (Flash required). The original is here.
Supposedly it took 606 takes, six million dollars, 3 months, and, most importantly, just one second of computer generation to link the two halves when an exhaust pipe rolls across the floor, to complete this short. Who knows whether or not it's true, but it does make all the difference in this day and age in how much it impresses you.
For a station wagon!?