What’s the other one?
Falling off presumably?
More the abrupt stop at the bottom…
Actually it’s being trapped in a confined space, there’s a book by Alan Garner, which describes a number of people, including children, having to squeeze through narrow underground tunnels, which has me hyperventilating just thinking about it, or the poor bloke in America who got stuck in a pothole after taking the wrong route; he was so stuck that he died stuck there, and it was impossible to get his body out, he’s still there, and the entrance is now sealed shut.
Walking naked through a shopping centre wearing wellies and a Stetson hadn’t occurred to me, basically because, while I might wish for the ground to open up and swallow me, my imminent death wouldn’t be likely.
I walked up to the Chalet des Pyramides, a little cafe overlooking one of the glaciers at Chamonix, and some of the others in the group decided to follow a footpath to get a better view of the glacier, so after a few minutes, I decided to follow them.
That was a mistake, I lost the path, turned around, and seeing the steep drop in front of me, completely froze! I had to carefully sit down, and scoot down on my bum, until I got to the path proper and stand up, using whatever trees were handy. Not necessarily terrified, but bloody close to it.