Ball lightning
This is true that people are watching ball power centuries. In 1963, a group of scientists on the plane were stunned to see a burning ORB float below the corridor and to get out of the plane. But now there are real scientific witnesses, so you know that this should be true. This though no one can say absolutely or it is just clearly creating. But these experts have rejected most of the thousands of accounts because some incidents can be easily interpreted.
sources - http://www.grunge.com/99901/unexplainable-things-witnessed-hundreds-people/
https://youtu.be