The best thing I've ever seen while driving was when I was racing across Idaho on my roadtrip to get home when suddenly my gps out of nowhere tells me that I can save an hour and a half by taking a detour. I had no idea why. I was in the middle of a pretty rural part of the state and twilight was setting in and the road looked clear, but holy shit, 90 minutes? I had no idea how or why this detour would do that but I took it anyways and got off the main interstate onto a frontage road.
About 2 minutes of driving later revealed VERY abrupt traffic backed up for miles. I had gotten off the interstate at the exact right and last moment. Everyone was pissed off and angry, so it seemed new. And here me and like three other cars were, racing past and completely skipping the traffic they were suddenly stuck in. There was no movement. Only traffic. I could feel their envy as I drove by wondering what the fuck was going on.
I fully expected there to have been a huge accident. Something like a head on collision. But then about four miles down the road, I see it. A tipped over truck, and thousands upon thousands of tiny brown potatoes still rolling across the road.
The driver was outside, his head in his hands, looking very much alright but appropriately stressed out, and behind him was miles of angry traffic caused by truck tipping over and dumping thousands of potatoes onto the asphalt. A potato spill. In Idaho. The state only known for potatoes. It still makes me laugh thinking about it.