When I was a kid I was so obsessed with watching dominoes fall. Now I laugh at what a strange cult fascination this was for me and many others! Taking much painstaking time to set up each domino, careful to not let them fall during set up, only to tip the first one with a gentle touch and watch them knock each other down. One by one. They make that cool sounding "clickity-clickity" noise as they fall. It became such a popular past-time that network TV shows, like Ripley's Believe It Or Not, would actually air these falling dominoes as national entertainment! The insiders call them domino chains, domino rallies or domino runs. Bizarre.