God rays, volumetric light, lens flares & dirt, visor reflections / water drops, depth of field, night & thermal vision scopes, dynamic wet surfaces with reflections, rainbows and many other effects.
I decided to add some animated dust effect to the sun shafts under certain conditions, like it's the case in dusty interior areas where the sun shining through a window illuminates the disturbed dust particles in the air. It's not perfect but still a nice addition I think.
Please don't get confused by the bad movie quality, the effect looks way smoother in "reality".
Note: This effect is computationally expensive thus won't run well on lo-end systems.