Corrected entry: Hermione says that Harry wouldn't want to run into himself in the past, that he'll go mad. There have most likely been many instances when something like that would happen, a polyjuice user encountering the sample, for instance. It would probably cause confusion, but it's very unlikely that someone would go insane as a result.
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Correction: She meant Harry's past self, who doesn't yet know about time-travel, would. At any rate, it was a figure of speech. Not that he'd just start drooling in his Cheerios with an Aluminum foil hat on his head at the mere sight of himself. Just that his past self's reaction could be dangerous.
Phixius ★