Holy crap that shows how much I look at the dates of these things. Didn't even realize it was that old.This thread is originally from 2008, so I think the OP was referring to the 3e version of the spell. But looking at 5e instead, I think it's perfectly fair to have the charm person spell induce hostility when it wears off. The one that shouldn't do so is the cantrip version, friends. Friends is what many people in the thread seem to mean when they think of a "positive" version of charm person – it makes you extraordinarily charming, but doesn't really mind control anyone. It just gives you advantage on Charisma checks against a particular person. Unfortunately, friends is the spell that explicitly makes the target hostile afterward, while charm person "only" makes the target realize they've been magically influenced and then lets them take it from there.