Here is a video of someone who setup a domino topple using books and the physics engine in Oblivion. In case you live under a rock Oblivion is a sandboxy video game which came out recently. The books are all in a row like they were dominos and the guy kicks it off by tipping the first one over. It does have some interesting twists thrown into it like swords that tip over and cut through rope knocking over watermelons which fall on more books and continue the effect. It also seems to have Rube Goldbergish machines built into it including a wiffle ball rolling down stairs, people crashing through stacks of barrels, and a mace and chain swinging to bridge some gaps.