As a kid, I always loved setting up dominoes in patterns and watching them fall. However, I never came anywhere close to what these guys have done. How do you do this? The time taken to put this together is a brain melter. Imagine what it feels like, after 3 months of setting all this up, pushing the first domino and watching all these fall...

From youtube :

Millionendollarboy and I spent over 3 months creating this awesome domino trick screenlink! There are between 20,000-25,000 dominoes total. Enjoy watching the neat effects!