in1978 i was riding on back of motorcycle a couple were in front of us. Over a large grouping of trees i a rural area to our left above trees was a bright silver objectthat appeared to be standing straight up???I guess a srhere shape??? Then it shot away , the other couple in front of us saw the same thing and pulled over as we were doing the same.Bright metallic seemed to have 3 shapes to it. this has always bothered me through the years as to what it was. Always the skeptic then but this left me in Question ! There was a humming noise very loudly in our ears much different then the sound of Motorcycles , the humming stayed with us for quite some time (ringing of the ears?)