The Dying of the Light
Roger Ebert on The Boston Globe’s article that many theaters are lazily using 3D lenses on 2D pictures, resulting in images that are too dark. It comes with this advice:
The title of the movie listed by the theater will have a “D” after it if it is being shown on a digital projector
If you are in a D movie, look at the projector window when seated. If you see two stacked beams of light it is a Sony projector with the 3D lens still on.
A single beam of light means no 3D lens, or a different make of projector that doesn’t have the issue
If you see the two beams, then get up and go complain. You paid good money to see the movie, so make a fuss until they either give you back that money or remove the lens. Seeing as that’s an involved and time-consuming process, expect a refund.