A finger puppet. (A mouse named Mr. Whitey, before he turned grey). I'm sure there've been computer-related bits in there, but I can't think of any off-hand, other than my flash drive.

"You need me. You wouldn't be much of a hero without a villain. And you do love being the hero, don't you. The cheering children, the swooning women, you love it so much, it's made you my most reliable accomplice." -- Lex Luthor to Superman, Question Authority, Justice League Unlimited