This morning on my walk to the bus, I hear an enormous BOOM and felt a pressure wave from it against my skin. It was deep sounding, like a bomb or a fireworks, and I have no idea where it came from. It scared the crap out of me and everyone else I could see on the sidewalk. It was not immediately apparent what it was. Did you hear this? It was about 7am. If anyone hears anything about what it might have been, I'd appreciate knowing!