golfy (g): So I'm going to ask you a question... I'm thinking of the word I've written down.
doctor (d): Mm-hmm.
g: Did you write down the same word that I wrote down? And you are to answer me 'No' all the time. Did you write down the same word that I wrote down?
d: I've no idea 'cause I don't know what word you wrote down.
g: OK. Did you write down a different word than I wrote down?
d: I've no idea.
g: All right, that's gone to the highest reading, the other one was low, and that one's high, therefore, the second question was 'did you write a different word than I wrote down' and I've written down 'ship', therefore you should have 'cat'. And which word did you write down?
d: Well, I wrote down 'cat', but--
g: Exactly. So there you go. Now how would you--why were you stressed on the second word and not on the first word? Because you showed no stress on this first word, and a lot of stress on the second word, so the second word I asked you, 'Did you write down a different word to me?' and you said 'No' or 'I've got no idea'.
d: No, I said, 'I have no idea'.
g: Yeah, but that's avoiding the question. So you showed no stress in the first question, I wrote--
d: But I said I had no idea if I'd written down the same word, either--
g: Exactly.
d: So I don't think your test actually proves anything at all.