Of course the obvious counter argument to the consistency of the sightings is that one person hears about a particular kind of sighting and their imagination makes them believe that something similar happened to them and thus, there forms a sort of "mass conciousness" or "mass hallucination." I find it to be a copout argument. Similar to whenever a UFO sighting is so big and spectacular that it is witnessed by literally thousands of people, it is filed under, "mass hallucination." As far as the explanations go, for the skeptics, it's the best one. Weak indeed.