This week on the Best of Car Talk, Laurie's Pathfinder earned the unfortunate nickname "Wobble Butt" because its rear end rocks from side to side. Can Tom and Ray calm Wobble Butt down and save it from further embarrassment? Elsewhere, Bob wants to know just how wacko his brother in law is for proposing adding duct work to improve the heat in Bob's mom's car. Also, Ellen's dad scolded her for having too many keys on her key ring; Chris got a little aggressive with his Dremel tool on his Camry; and Ray shares the joys (and terrors) of teaching middle school, while trying to help Susannah strengthen her anemic windshield wiper squirt. All this and more, this week on The Best of Car Talk.