This week on The Best of Car Talk, distilled water may be too hungry for John to use it in his radiator. Will Ray's explanation of the hungry water theory help clarify things, or as usual, only further obfuscate matters? Elsewhere, Linda's husband proudly claimed to have "fixed" her Volvo—by chopping off its roof. Now is it safe for use as anything other than a planter? Also, Kunal wants to give his horn testosterone treatments; Diana's van could be a new form of germ warfare; and on Stump the Chumps we find out if Liz found her gas leak, and the perfect jumpsuit. All this and more, this week on The Best of Car Talk.