But this time, 16-year-old Preston had a plan: He set up a video camera inside the house and trained it on the sign from behind a window. He figured he would catch the thief on film, should he return. He hooked up the camera to a Web site that provides live streaming. He wrote a few words on the site explaining its purpose.

And then, the handmade sign with red, uneven letters went global.

A few people started watching the video, which shows the sign next to another sign endorsing a local candidate, beside a flowerbed. The only reliable action consists of the occasional car passing in the background.

Still, by that first evening, more than 100 people were watching. The next day, when Preston checked the site during lunch at school, more than 450 were there, not only from around the U.S. but as far away as Australia, Sri Lanka and Japan.

"We had no intention of making this so public," says Preston, who goes by "signkid" on the online chat that runs next to the video. "It just kind of took over by itself."

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