The alien research discovered that they could grow the brain massively at the expense of security. The aliens knew not what they wrought as the mighty Brainskull took to the streets to bring justice with his x-ray eyes. Ok, maybe none of that is true, but he looks badass. He's going to look badass on you when you wear it and thus imbue you with the badassness of his assless skull (though we have to admit that there's never been any skull that has HAD an ass, and so, by default, Brainskull would have to fall into that same category. Don't think about it too much.