"While photographing elk at sunrise in the Cataloochee Valley of Great Smoky Mountains National Park I turned around to see what appeared to be just a curious young bull sniffing a photographer's camera. I snapped a few frames of the apparent harmless encounter."

But the elk became more interested in making trouble than simply the scent of a camera. He started physically harassing the photographer, escallating to full on head-butts.

At a about 3:50 in the video it gets a little rough...