I had been through a few earthquakes before the '89 shaker, mostly waking up at night to glasses and picture frames rattling. I was living in Southern CA at the time, but not LA. Anyway when the big one hit I was working in an upscale mall, doing a shift by myself in the boutique I worked in on the 4th floor. We always worked alone and the store had a state of the art sound system which I had cranked up very loud. So there I was standing near the register and I started hearing strange sounds, even despite the loud music. Hard to describe. Then glancing around I saw that the walls of store were undulating, it was the weirdest thing. At first I honestly thought I was imagining it - it felt surreal. After it was over I went out onto the 4th floor terrace and noticed all the employees of the other stores had come out of their stores as well and then it struck me that it had been an earthquake. I'll never forget the undulating walls though. Like they were made of rubber or clay. I wouldn't have believed solid walls could do that until I saw it for myself.