Nothing out there? Oh yes there is! Many years ago I was up from Barton in the Chippy on a very windy day with Rooftop in the back seat when we saw a UFO. It was black, and flashing a bright light at us.
I headed over towards it and to my surprise quickly reached it. Turned out to be a black plastic bin bag fully inflated and tumbling end over end, flashing as it reflected the bright sunlight on each rotation.
Now then. A bin bag at 1,500 feet. How could that have got there? Gotta be the work of aliens, innit.