1. A sudden shift in a newcomer’s interaction style (social insight has been conveyed to the newcomer).
2. A change in facial expressions from ministerial spouses (pillow talk about workaday aggravations).
In other words, human social groups act like human social groups, regardless of the particular shibboleth.
If we are stories we tell ourselves about ourselves, then the accuracy or the particulars of the stories aren’t so important as the social consensus that carries them.
An unconventional observation brings about fear because of both its implications about the nature of the social group and its threat to acceptance by the tribe.