TechTV actually does that sometimes. They did one segment where they took their WIFI laptops out on the streets of San Fran and hopped onto people's wireless network connections. They showed you how to do it, several programs to try, and made it seem really easy and fun! Of course, they threw in what seemed like a tacked on statement that this whole thing was to show how easy it was to do this, and consequently these people should try to secure themselves.
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Matt