My whole neighborhood has seen odd stuff around here and virtually everyone here is a pilot, so I doubt they'd misidentify a known aircraft.
The wife and I (both pilots) saw a really wierd craft of some sort a couple of years ago while driving through SW Wyoming. This was about 2:00PM local time. It looked like a gray and black hot air ballon, but it was moving sideways at about 300 knots. We were on a hill a mile or so away from it, close enough for me to see the shadow it cast on the ground. It passed between us and another ridge about 4 miles away, then disappeared into the haze. The really odd thing is we both had cameras sitting on the seat between us and neither of us even thought about taking a picture. In fact, we didn't even really say anything for about 20 minutes. It was weird.