Philosophy on Car Talk -- Which show was that?

I once listened to a Car Talk CD in which the brothers discussed a deep philosophical question. The question was something along the lines of: “Can one person or two people be more wrong?” A listener wrote in his answer to this question, which was read aloud on the show. It was a very funny and true answer to that question, in which he spoke of how two people, by reinforcing eachothers totally ridiculous ideas, can talk themselves out to the far reaches of a totally absurd idea. I hope to find this piece of audio. It was on one of the CDs published at least three years ago. Can anyone help me? Thanks!