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It's been a while since I busted out my wiccan bible and had a little go with witchcraft, but I recall voodoo dolls not requiring power, or USB connectivity for that matter. Upon stabbing this voodoo doll with a pin, knife, icepick, etc it will spout out "nastygrams" on the computer screen that it is connected to. This doll, called Voodoo Word, isn't out yet, but it supposedly should be available soon.

The Black Arts are bus-powered [SlashGear]