-"Um. Illustrative case studies are hard to come by. It takes some incredibly rare coincidences for an accident to take out exactly enough of the brain to leave the patient alive but with deficits demonstrating the functionality of the frontal lobe, or for a boy _with an identical twin brother_ to be raised as girl after a botched circumcision—"
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-"More like circum-_trans_-ion if you ask me!"
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-"_I didn't_. Anyway, it's not like we could deliberately invent such horrors to inflict on human subjects, just to find out what would happen."
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-"It's not?"
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-"Well, it would be unthinkably unethi—I don't like that look on your face."
+"Nevertheless, there are, in fact, four lights. It's OK if you don't believe me, but I counted them, and I recounted them a few more times, and I'm not going to pretend to be confused about the number of lights unless I discover some specific reason to suspect that I miscounted in the same way every time."