I thought I might be seeing a new supernova once when I was a kid. I was an avid amateur astronomer then, so I knew that the bright point of light I was seeing was not supposed to be there, and it showed no apparent motion even though I watched for a while. I went in and got binoculars and could still see no apparent motion. I then went to get my telescope and set it up, and by then I could see there was some motion, so the thing could not be a supernova.

The motion got faster and faster, and it soon became apparent what it was. It was a B-52 very far away heading for an air force base that was 3 miles from our house, with its front light on, descending in a way that had it coming almost straight at me.