I'm extremely skeptical of the concept of a shared delusion (although shared misinterpretation of an optical illusion of some sort is a possibility), so I think

I'm extremely skeptical of the concept of a shared delusion (although shared misinterpretation of an optical illusion of some sort is a possibility), so I think it's more likely that you both did see something. What it was is the question. Thanks for sharing that. I wonder if anyone else has seen that in the area as well. I'm not sure how one would find out. Besides looking it up on Google Maps, did you check Street View too? I was thinking it might have been the red reflectors some people around my neighborhood have to mark the edges of their driveway entrance. They're on a scrawny metal pole and about taillight-height, and could be mistaken for a car's rear end from a distance, I guess, if there were a pair of them, and they caught the headlights just right. If an area is rural, no streetlights, I could definitely see someone having those. Again, thanks for sharing.