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]