I want to write Kaiba and Yami drunk!fic now (lol). I agree about Kaiba being an angry drunk, because let's face it anger and Kaiba just go so well together - and especially that I really don't want to know what would drive him to drink. Although I also like the idea of him getting drunl because it's the only way he can let down his guard - unfortunately, the emotion he'smost used to expressing is anger - so I think you'd end up with angry drunk all over again.