What was the strangest, most unexplainable thing you've ever seen?

GLP is full of people with stories. Lets hear them. Here's mine.

When I was in cub scouts, sometime in the late 1980s, while camping at Oquaga Creek State Park in NY, myself and 3 others saw a UFO. It came over the tree line, was round, like 2 plates on top of eachother upside down, with red, blue and purple lights in the middle. We heard it before we saw it. Sounded like a really deep humming/vibration sound. It was moving rather slow and not very high, maybe 1000 yards high, hard to say we were scared as fuck but none of us moved or said a word until it was gone. We watched it glide out of view, maybe 2-3 minutes until it was out of view then we ran and told a friends dad who promptly told us to shut up and go to bed.