Ok, she's actually not that scary. However during a Halloween party they used uv lights to really bring fear into the hearts of everyone in the room.
Why do I love this shot? One because the look it priceless but mainly because it was hard to do. Bugger all lighting and a fast paced dancer usually makes for nothing but blurry useless junky shots. This one. After hours of preparation and having the camera set just right. I got lucky. Over and over again :)