Okay it looks more canine than bear-like but this is without a doubt one of the COOLEST things I've found in recent weeks if not in the last long while. Joshua Allen Harris you're a genius!
Harris decided he'd make animals out of plastic bags and tie them to the ventilation grates of the subway, in what I presume must be New York. A train passes by underground, sends air rushing up and Voila! the creatures come to life. See pics and more info on Wooster Collective and the insane video of these beauties on Youtube here.