Have you heard any weird booms and then perhaps been knocked off your feet?
A series of strange window-rattling booms or rumbles have been heard and felt in recent months in Alabama, North Carolina, Mississippi, and, on April 4, in San Diego County. …nobody seems to know what the hell caused the disturbance. …"My garage door is double steel and it weighs about 500 lbs.," a man in University City wrote. "It was rattling back and forth like a leaf in the wind for about 3 or 4 seconds." … one of the leading explanations for the San Diego disturbance is that the military is testing a top-secret spy plane called the Aurora…
The military denies knowledge of such a plane. [Source]