In the wee hours of the morning, while the sun shone brightly on the other half of the world, a couple thousand Long Islanders sat in their cars in silent anticipation. The cars were neatly packed into a dark parking lot, every here and there one illuminated by the eerie glow of a lamppost. The fenders sat a little lower than usual in these first moments of the day after Thanksgiving, as most bellies were still stuffed to unusual dimensions with turkey and pumpkin pie. Floor mats were littered with the pages of a Wal-Mart flyer that had long been committed to the memory of every shopper. Visions of $69 digital cameras and $28 vacuums danced in their heads.