Here's what caught my eye...
This is called "Painting with Light". Basically when the shutter is held open for a long period of time, the camera sensor picks up light and only stationary subjects can be seen. So... you can manipulate light rays (by using a flash light in this case) and if you move around fast enough the camera doesn't "see" you. Here you can see my legs (sort of) as I stood in one spot spelling the letters of my name.