A researcher into UFOs that I respect (Richard Dolan) thinks that there might be something to this curious 1991 UFO incident video recorded by Space Shuttle Mission STS-48:
I suspect the two flashes that initiate the video sequence are the shuttle engines, and consequently we’re looking at ice crystals. As human beings, we’re narrating animals. We see an object reverse itself with apparent intentionality, and then we see a zip of light, and we put the two together and we’ve got an alien spaceship dodging a Star Wars laser! Still, why would the shuttle not shift its position on the horizon from the brief rocket thrusts? Dolan briefly discusses STS-48 at around the 14 minute mark of this Paratopia podcast (episode 32 here).
Prometheus Unbound 