Last night turned out to be very strange. At around 2:30...

Last night turned out to be very strange. At around 2:30 am, I was woken up by a pounding noise. Our bedroom is on the second story and our house is in a cul-de-sac, so the acoustics are odd. Sounds that are across the street will sound like they're close enough to be in our yard, and so on. But we had two windows open, one at the front of the room, looking down on our front yard, and one in the master bathroom, facing the side yard and our neighbors' house. But this was definitely pound...