This week on The Best of Car Talk, Tom and Ray stray ever further into terra incognita, as they try to help Sharon figure out why her hair looks lousy after a long drive. Procter and Gamble may have issues with Ray's diagnosis. Elsewhere, Sharon's car is making a "lurid groan" when she turns. The noise is making her a star at the retirement home, but should she be worried about it? Also, from the marital disputes department, Cathy thinks her husband erred by driving down Mt. Washington in 1st gear rather than riding the brakes; and Lynn is worried that a cold water car wash on a hot day can warp her brakes. And, has the New York Times really found the world's funniest joke? All this and more, this week on The Best of Car Talk.