I also remember having a conversation with a demon in hell and being told I make its skin itch when I'm good alligened.
That's actually not too far off, not all good aligned creatures would make a devils skin itch, but I remember reading somewhere or other that a person blessed by their god such as a paladin or a cleric makes a devil/demon physically uncomfortable and divine magic makes their skin itch/prickle/feel cold when they're near it even if it's not directed at them. Not sure how canon that is for D&D lore, but makes some sense imo.
