LIKE BRITNEY SPEARS, we had an "Oops, I did it again" moment in our long-term Lexus LS when, at around 11,000 miles, a small rock smacked the front windshield, leaving a two-inch eye-level crack in front of art director Andy Foster. Just three months prior, with road-test editor Scott Mortara behind the wheel, an equally feisty pebble had struck the windshield, depositing a similar blemish. While Mortara's road wound was purely accidental—the car in front spit up a suicidal stone—Foster’s wasn't. On his way out of the ghost town of Bodie, California, near the ski resort of Mammoth Lakes, Foster passed a group of slow-moving Harley-riding weekend warriors, which, unbeknownst to him, grew mighty upset over his fully legal, totally safe maneuver. So to teach Foster a lesson, one of…