Anyone who says seeing wierd lights at night constitute a UFO is nuthouse material.
A "UFO" is nothing more than it's name suggests; an "unidentified" flying object.
I had an experience like that around 25 years ago. Several motorists all stopped and got out of their cars to watch this odd thing for about 5 minutes, then it vanished. While the flying object was "unidentified", I never assumed it was extraterrestrial or anything. I just figured it was some manmade object we couldn't "identify".