Thinking about it, this probably should have been before the couch one... but still.

You see, Xerxes is a bit dim. He seems completely oblivious to the fact that he's... well.. fat.
If people were to say he's overweight, or flabby or an ever growing mass of flesh... he just doesn't see it.
I guess it's kind of like a reverse anorexia.

Oh well... as long as he's happy ^^