So I was sitting in the train and thought that the train-screen wasn’t working but instead my polarized sunglasses exactly blocked out the light-rays of the screen. This is because of the physics behind the polarized glasses that only lets light through under a certain angle. So in short, I almost missed my train stop because my sunglasses blocked out the electro-magnetic light-rays of the train-screen and it gave me a small heart attack.Guy shows the difference looking at the television screen with his sunglasses and without. With sunglasses, the screen is black. Day time, bus, train, black or grey seats.