Licking the lid

There are plenty of things that one does in the privacy of one's own home (plucking, picking, licking, scratching and scraping) that are fine confined to the gaze of nobody, or only those who are used to your revulsive habits.  Much as you would be unlikely to make any friends by whipping off your socks and whipping out a nail clipper in front of your colleagues, yoghurt-consuming individuals should really consider the fact others are trying to eat their lunch whilst you slither your tongue over the foil covering of your pot and proceed to poke it around to scoop up all the yoghurty lid residue.  Quite a repulsive spectacle!