A friend of mine, probably the most down-to-earth person I know, saw one of these years ago - shook him up pretty good. He's convinced it's a secret government craft.
Me too! I don't believe in ET visitations, but I saw one of these a couple months ago and it sure didn't look like any aircraft known to the general public. I almost ran off the interstate and actually turned around at the next exit to go back to see if I could see it again, but by then it was gone. It was very low (and therefore big) and I had an extremely clear view of it.