As for why what he remembers is a triangle, a triangle UFO was put into the public consciousness in the 1990s. There was a huge wave of UFO sightings in Belgium that made worldwide news. there was one photograph that came out of this, of a big black triangle with a bright light at each of the three corners.
ever since then, triangular UFOs have been featured in movies, TV shows, The X Files, The black triangle UFO is a popular character, and it all goes back to this Belgium case.
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