Except bloom. If you look an object masking a powerful light source, you can see light diffraction around its edges. If not overdone (like in outerra), it can be a realistic improvement.
As well as shining light points in metal/glass, which release some "rays" around them, like this:
In the image, the effect is of course overdone by the camera lens, but the eye too sees an effect like this, just less evident.