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.
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
The red part also looks kind of like a head. This is clearly a picture of God preparing to choke out Satan from behind. What's not clear is that it isn't because they are fighting, but rather it's just a bit of kinky sex play.
It is now revealed after wandering out of our little enclosure that we are merely pets kept in God's bedroom, or perhaps not quite pets, but something more like sea monkeys.