I noticed my Sideburns turned grey after a friend (who turned out to be a Covert Vulnerable Narcissist) had me worried about his rotting Teeth because he ate too much. At one point he spent an entire day and night thinking he was gonna die from Gum Shock.
But then one day, he said in a total care-free attitude that, he never bothered brushing.
It was such a betrayal to me. Learning that his overeating was never the problem. To make matters worse, he then decided that it was actually funny. It's like he punished me for making me think (and care) that he was going to Die.
Edit: Classic Narcissist 180 crazy-making.