I heard the twin sonic booms today caused by the Atlantis space shuttle when it landed at Edwards Air Force Base. It scared the crap out of me. For a few seconds, I thought it was an earthquake and waited to feel the earth move. Instead, I only felt what seemed to be a small vibration and the windows and glass sliding door shook loudly. The weird part was hearing the two booms and then hearing them echo on across the city.
If it was that loud here in San Diego, just imagine how loud it was up north!!