Aveline, I don't have a snap but once I had a black and white cat with a head at either end! Thor and his sister Sif were sleeping on the same windowsill with their bottoms touching and their bodies in a straight line away from each other.
I've managed to find four ears and the heads they are attatched to in your photo, but where the rest of either cat begins or ends is a complete mystery - glorious photo of two lovely cats.
Bowie is beautiful, too and judging by the size of his hind paws simply enormous! How long have you had him? Perhaps the spitting and hissing is nearly over and done with, he does not look scared in the photo - sound asleep and no early warning systems active by the look of things.