My ears ringing, I ran out the front and my daughter's boyfriend ran out the back, looking for the tell-tale cloud of debris and smoke that would signal the instant revamping of my humble abode from single-family dwelling to impenetrable fortress. I wondered if I had stored enough water.
No further compression blasts occurred and there was nothing we could see that indicated the event had happened at all. Nothing on the radio, no neighbors standing outside in confusion and panic. We were, shall we say, nonplussed.
Later, to my delight and embarrassment, I found that the sound and incredible compression that we had experienced was the result of this:

The re-entry of the Space Shuttle Atlantis just before its crippled landing at Edwards AFB at 12:49.
I wish I had known before, as I could have enjoyed the moment for what it was. But even now... how cool is that???????????????????????????