A UFO (n.) behaves not like a body but like a weightless thought: something is seen, but one doesn't know what.
A UFO (n.) flies, in the rumour's account, like an inquisitive insect or a group of tourists unsystematically viewing the countryside, performing acrobatics before the noses of exasperated pilots.
A UFO (n.) is somehow not photogenic: a man who watched one for an hour in daylight in Guatemala, camera in hand, forgot in the excitement to take a picture.
A UFO (n.) could naïvely be read as a 'soul' — a rotundum, an archetypal image of the self, the totality of conscious and unconscious.
The UFO (n.) explained psychoanalytically as a repressed uterus coming down from the sky is just as mythological as in the technological fables — and what about the male pilots?
A UFO (n.) might be a sort of Charon — a ship from the beyond fetching souls; such sightings were once read as portents of a 'great dying'.