Once upon a time, some random dude got locked on the roof of a building in New York. A bunch of evil mutant pigeons flew down and pecked out his eyes and ate them. These pigeons then turned into replicas of him. So more came down and pecked out THEIR eyes and turned into more replicas.
And this continued until the dudes were piled high and overflowing from the building.
And so the original guy ate all the others and then exploded into pigeons.
And then a new guy got locked on the roof....