I have seen a few UFOs.... One especially sticks out in my memory:

It was a bright light (appearing about the size of a star) which streaked back and forth across the sky.... and would "stop on a dime." As we watched this UFO, it made right angle turns in the late night sky (it was approx. 4am) and zipped back and forth doing unimaginable aerial maneuvers for about 5 minutes.

Then, it began to grow fainter and fainter... until it was no longer visible. To this day, I remember it as though it was yesterday as it made an impression on my memory.

Cannot say exactly what it was... but it definitely was not from this world.