Lighting Theory

From my favorite online short fiction film, Dr Horrible's Sing Along Blog.
The key light is coming from the florescent lights above and in front of him, giving a significant glare off of his goggles and nicely highlighting his nose. There is a fill light coming from a window on the right of the picture, giving a blue tint to that side of his face, rather than it being coated in shadow. There are also two back lights that give the subject that nice highlight from behind. One is from the window on the left and other is from the strange tank directly behind the doctor. Other than the window and the tank, there is very little light elsewhere in the scene, making the doctors secret lair look very dark and mysterious.

Another shot from the same show. In this shot, the key light seems to be coming from the right, with a fill light on his left to cancel out some of the shadow. There is also some interesting reflections from the florescent lights on the ceiling, namely the spots of light on each side of his head, though there does not appear to be a back light this time, as there is not a highlighted glow around him. The ceiling lights also illuminate the rest of the scene, allowing us to see the frozen yogurt container in the background (which played a part in the film before).