Click to view "Great fleas have little fleas upon their backs to bite 'em, And little fleas have lesser fleas, and so ad infinitum. " Alright...so these are just 30,000 dominoes stacked up in blocks to look a bit like giant dominoes, and tipped over to create a fab tumbling dominoes-made-from-giant-dominoes video, but you get my point. It's Friday, and the video has a cat in it and makes for good watching. [CollegeHumor ]