It's funny, just today I was discussing the USGS Earthquake web site with a colleague at work. Then this evening (about 40 minutes ago), I was sitting peacefully reading the newspaper when the whole house started to rock and the windows rattled. This quake was located 16 KM deep and 2 KM NE of Lafayette, CA - which is about 10 miles from my house. Maybe 12. It was magnitude 4.2, which is a healthy shake, enough to make the house creak really well.
If you've never sat through an earthquake, they're very unsettling, because your house isn't supposed to shake under you like that. Also, they create a weird form of time dilation - the seismograph traces (available on the USGS site) show that the shaking lasted for 12-15 seconds, but it felt like about 5 years. And this was a relatively minor shake; I remember the Loma Prieta quake (6.9) which I would have sworn went on for 30 seconds or longer (but Wikipedia says it was 15 seconds; I'm still not sure I believe that). There's always a point in a quake where you ask, "Isn't it done yet??" and it's not.
With all that, it's over now, and nobody was hurt, and nothing even fell off the shelves (at least not here). At least we don't have tornadoes.