A Chankiller is a very intelligent but very, very rare species. Not many have been found in the wild. They have the ability to speak the language of which where they are found. A Chankiller is known to be loyal and be peaceful towards humans, but if you show any signs of aggression, or be rude to it, it will act back.
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.