A few years ago, I drove myself to an eye appointment in downtown Nashville

[70sEraVet]

I had my eyes dilated, and as I was checking out, the girl offered me the cardboard sunglasses. I looked out the window and saw that it was dark and cloudy outside, so I passed on the funky glasses.
Turns out, it was dark and cloudy because it was RAINING! Which meant that all the cars had their headlights on, reflecting on the wet streets.
Lesson learned.