This week on Car Talk, after one especially unhelpful call, Tom voices the question that so many listeners have asked over the years, "What are we doing here, anyway?" Happily, Ray is at the ready to solve his brother's existential crisis by explaining that their proper roles have little to do with giving correct answers. Crisis dismissed, it's on to an epidemic of things flying through the hood of cars--for Mark in Connecticut it's the new spark plug he put in his fiancee's Geo Tracker, and for Ray in Utah, it could be his entire blower motor. And, can an odometer be off by a factor of 10, or is Ruth-in-Virginia's son having a little too much fun in their 1970 Dart? All this and lots more on this week's encore edition of Car Talk.