This is a tree knot that looks like a ninja turtle face. Somewhere in the woods right now Shredder is trying to set a pile of pine needles on fire with a magnifying glass and Smokey the Bear is all, "AAAAAAAH, WHAT'RE YOU DOING?!" Me? I'm regretting a lot of the decisions I made last night.
Cowabunga! The Teenage Mutant Ninja Turtle Tree [obviouswinner]