I rode for a couple of years with a pair of sunglasses, and then went on vacation without them so I bought a new pair that were very similar to my old pair. When I got to Chicago and went for a ride along Lake Shore Dr, I thought my computer had gone bad because half the screen was invisible. I figured it was from being outside on the car. What I figured out a week later was that my new sunglasses were polarized, and my old ones weren't. Duh. In that time I never looked at the computer without my glasses on.

Now that I'm older I can't see anything anyway...