It starts simply:
I got up to join [my husband, Frank], and as I did--as I started across the room--I felt the floor sort of shake. It only lasted a moment--less than that, I suppose. Just an eyeblink. But the floor very definitely moved. "Good heavens!" I said. "What was that?" Frank just looked at me. His face was a perfect blank. It was obvious he didn't know what I was talking about.It happened again. And again. And it got worse:
Sometimes it was though I were sinking into the floor. The room would tilt and I'd take a step, and the floor was like snow. It would give under my foot and I'd sink what felt like an inch, and other times it was the reverse--the floor would rise to meet me. . . . By then, it wasn't simply the floor that moved. When the floor tilted, the walls of the room tilted with it.For the reader (or the listener), the instability culminates in an absolutely terrifying trip through an underground pedway that reads like a nightmare out of Bolano; for the poor woman who suffered through this, it eventually culminates in a diagnosis, and, fortunately, remission. But I'll leave that part a mystery for now. The essay is short, and the podcast, even shorter, is available at the "Radiolab" site. If what I've quoted creeps you out as much as it did me, you definitely should check out the rest.