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@ DEFCON - The wall of sheep | Make:
At DEFCON there's a wall with a projection of username and passwords (some of the passwords, that is). When you use any wireless here, it's safe to assume that all the packets are being captured and if you're foolish, you logged in to webmail, pop, AIM, etc... DEFCON is reality concentrated into one spot -- when you see your friend's password on the wall, and a big sheep go by, it's a clever reminder. Here are some photos...