Your grip on the physical world loosening, your very existence fading, your body disappearing into the void slowly, making room for those the world is worth. Your mind spiralling chaotically down a worsening depression. The very worst of insanity spreading through your mind to the core, until you can't take it. You will either be led into suicide, or Grim himself will personally handle you.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"