When I thought that I had driven my car off the side of a mountain.
I was on a road trip and was driving over mountains, on roads with no railing, and along the way I thought to myself how bad it would be to make a mistake and drive off the road, you would just tumble down the mountain to your death.
I tried to drive extra carefully, but one pothole in the road was all that was needed to get me to lose control of the car and drift of the road.
Luckily, that portion of the road was surrounded by trees and was not as high as the rest of the way, so I didn't end up tumbling to my death.
But in the 2.5 seconds that I was heading for the cliff, I was in complete shock and thought that this could be it. When the car stopped, and I was still alive and near the road, I think all I could do was to start laughing.
That could have ended completely differently just a few moments eariler.