Today, 6 people in a van, heading to Rochester... and they have a car AC adapter. It plugs into the cigarette lighter, and I plug my laptop into it and charge. But this time, I'm not the only one with a laptop out, so someone asks the question: "Can you let us connect to the Internet through your wireless?"
Well, yes, it turns out I can. So now three of us are online, and of course, all posting to LJ. I'm even broadcasting the SSID, so a car keeping pace with us could get on my network too. "This would be useful for a convoy" says beowabbit :)