Earthquakes, of course, though I was never injured by them. In the 1980s there was a big quake in the SF Bay Area where I grew up. Among other things, it caused the top level of a double freeway overpass to collapse down on the lower lever, crushing many cars. I used to drive on that lower level frequently. In fact, I commuted daily on it when I worked in the city years earlier. But, by the time that quake happened, I had already moved south to LA.
After moving to LA we had a big quake here in the 1990s. It collapsed a multilevel concrete parking structure like a stack of pancakes. I used to park on the bottom level every day for a job I had but the business moved to another location about a month before that quake. It happened early in the morning when I was still in bed. It literally threw me out of bed to the floor. A few days later I was standing in my apartment and a strong aftershock yanked the floor sideways, folding up one ankle. I limped for a few days afterward. Then, I was at work in a tall office building when another aftershock hit. I was on a break outside on a terrace 18 stories up which tossed and rolled like a boat on rough water. That was kind of exciting.