It began about six months ago, perhaps on a dare. A lone woman posted a photograph of her own breasts in the "Rants and Raves" section of Craigslist and held up a homemade sign that indicated the portrait was an intentional "flash" to all of the Web site's meaty-pawed users. The hearty response spawned yet more photos from exhibitive locals who obscured their faces. In some cases, the subjects held signs that listed the date, time, and place to authenticate the deed -- hey, these weren't '80s photos stolen from mom's stash. In one memorable instance, a sultry blonde artfully posed outdoors in front of Interstate 580 signs. In the fantasy, she was all ours. She was a 510 gal, the girl next door -- the girl in the next cubicle! Or was she? Since "Flash Fridays" spread across Newmark's planet, an unfortunate outgrowth of fake pics has upset the fantasy-reality continuum. It's now more likely to host a batch of gag pics posted by angry ex-boyfriends or prostitutes on the prowl. Regardless, a few authentic flashers still find their way onto the site each week, and for a moment each Friday, we still enjoy the thrill of catching a sneak peek.