The concept is simple, empty your pockets onto a scanner, then press your face down on it and hit "scan." The collection of people's scans is fascinating.
It's one of those weird sites where your first thought is, "wow, this is neat." Followed quickly by the skepticism of "wait, some people are staging the contents of their pockets." And then slowly, after a dozen more faced-pockets, you realize that "staged or spontaneous, there's something eerily 'genuine' about this."
I've pulled a dusty HP scanjet 4670 out of the closet just so I can contribute, because after a few dozen faced-pockets you just can't stop wondering how *your* scan will compare.