Planking flash mob, Millennium Park, Chicago | Photo gallery
Perhaps you've heard of the "planking" craze? Exhibitionists go out in to the world and find odd places to lie completely flat and have their picture taken. It's a meme that has already practically run its course—we hear "owling" is all the rage these days. Some large-scale planking recently took place in Millennium Park, as more than 100 participants formed a flash mob and lay flat and motionless near "the Bean" for three minutes. We captured the befuddled looks of tourists and bystanders, as well as the plankers themselves in our photo gallery.