The Worst Turbulence I've Ever Had

I was reading a book and just minding my own business, as we say. The turbulence started to get a little rockier. In English, when we say that something is rocky, that means that it's not smooth. And then all of a sudden, there was a freefall. It was like being on a roller coaster or something. When suddenly you just go down very fast. No one was ready for this."