Apparently the three-day-weekend wasn't quite long enough for some pranksters in Ridgefield, Washington. School in Ridgefield was delayed for two hours this morning because someone had let the air out of the tires of the school district's entire fleet of buses. The pranksters were quite polite—not slashing the 22 buses' tires, but simply stealing the valve stems. This prank effectively halted operations long enough for students to catch a couple hours of sleep and eat......