That's just too smart of a point, I'm afraid I'm all smitten. Though a construction next door or a demolition few blocks down the road would've been a simpler explanation.
Yeah, that was a little glib. My point was, testimony is what it is; pointless to guess at their situation. Perfectly fair to do statistics on reports, if found in sufficient numbers.
"I would sooner believe that two Yankee professors would lie than that stones would fall from heaven!" - Thomas Jefferson
The point being, whether we believe it or not changes nothing. This person experienced it.