Ass Whuppin' is a silver-bordered card from the set Unhinged whose card text reads "Destroy target silver-bordered permanent in any game you can see from your seat." Technically, if me or my opponent have silver-bordered cards in play, I can probably see them from my seat, so can I target them for removal with this spell? Or does it have to be a silver-bordered permanent from a different game? I've checked the Unhinged FAQ and Google, and can't find any answers to this scenario. The FAQ does mention that the target has to be in a silver-bordered game, i.e., a game where at least one player is using a deck that uses at least one silver-bordered card. But that's about it. Technically, if I'm using Ass Whuppin', then I'm in a silver-bordered game myself.
Edit: It's occurred to me I should probably provide the FAQ: Unhinged FAQTIWDAWCC