The absolute stupidest shit ever. Come on, who finds this entertaining? I'd rather get my face ground off with fine-grit sandpaper. Slowly.
If you were wondering what it actually is, it's just a bunch of wierdos who have nothing to do but find the most weird-ass places to lay face-down. I saw this guy planking on the top of a McDonald's sign once. Just don't plank, it's so stupid and makes you look like a loser. Don't even get me started with owling.