I remember a few years ago I was outside taking a smoke break at work and heard this low rumbling that seemed to be coming for nowhere. At first I thought it was a CH-47 or UH-60 that are pretty common around these parts. After about a minute or searching the sky's I see this huge aircraft flying at maybe 1000ft. Finally I am able to make it out and my jaw litterally drops. I must have looked like at idiot running around the building as fast I could trying to keep it in sight. What I would have given to have my camera with me that day.