Whoops, I over-generalized. BUT it also bolsters my hypothesis about why one says "a unicorn"--because one would say "an unseen person" on account of the lack of the pronounced Y.
In simpler terms, it's just an added consonant to avoid an awkward glottal stop.
There's a unicorn in space, AWESOME!!!!!!!!!! LOL
A picture of jesus was on a dog's ass
Galactus is coming!
It isn't flipping us The Bird
so rest assured it is not the hand of god.
It's like the likeness on a piece of bread, only bigger