Beyond

The pilot of an experimental fighter jet passes mach 2 and then sees a UFO, off his wing, matching his speed. He believes that the craft will collide with his jet, so he ejects. Later, he tries to convince the authorities that he wasn't imagining it. They finally convince him that what he saw was simply his own pen, floating in free-fall. However, after the jet's wreckage has been retrieved, even the authorities know that the pen explanation is wrong, and that there was probably a real UFO.