did you feel it?" page -- FOR SCIENCE.
When you do that, among the questions is, "How did you respond?" You can choose between "No answer/don't remember," ""Took no action," "Moved to doorway," "Dropped and covered," "Ran outside," "Other." I mentioned to my partner, "They're missing one." He said, "Run to the computer and look up the quake on the USGS site?" "YES!" So I chose "other," and told them we ran to the computer, and that I thought from how it felt that it wasn't on the Hayward fault (it wasn't, it was on the Calaveras), and that I thought it was a 3.2 or so. Then I saw how deep it was and said, "That's pretty deep, it was probably a 4 or so." And bingo, I nailed it. I used far fewer words to explain this to the USGS.
(If you actually want to read the text in the image, which is a twitter-and-other-things friendfeed screenshot of folks responding to the quake, VIEW BIG.)