It was downgraded from 4.2 to 4.0 after a few minutes, but we just had another quake. We think it was centered about a half mile from a friend's house nearby, and only about four miles from our house.
It was the typical WHUMP that shook the whole house, as if a sperm whale had just fallen from 50,000 feet onto our driveway. Immediately, I blurted out, "That's an earthquake!" as if either of my boys needed clarification. My older son, pale as a polar bear watching "An Inconvenient Truth," shouted wide-eyed, "What do we do?" I had no idea. Run outside? Duck and cover? Run screaming in circles? He demanded again, "What do we do?"
It was then, about four seconds after the initial WHUMP, that I felt the gently rolling wave sway the concrete slab beneath my feet. It actually was kind of a pleasant sensation, like a hammock or cradle really, and I knew the quake was over. So I put my hands out, smiled, and replied, "Enjoy it."