(Excepting e.g. a subject with given mental susceptibilities such as depression or OCD.)
And even more obviously, epilepsy. Yet, I don't understand why you would except them.
'You see, X does not exist, since I choose to ignore all the cases in which X does exist; I hope you'll agree that this argument is watertight once you grant my premises.'
Gwern, this thread is about the Basilisk. Conflating that with epilepsy is knowing equivocation. Don't be dense, thanks.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Of course, for "every Monday", the last one should have been dated July 22-28. *cough*