A Fehler is that type of a person who claims, that he Fehls everything you think. They a More often revered as Empathic Fehler. Be careful not to confound that with symphatic Fehlers. Those people are homeless, and will try to rob ur clothes, so ur naked
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.