And the steel mug was affixed to a hardened mass of milk. Once it is established that it has been gripped hard enough to pull it from the goo - not a good deal of strength necessary, only the probity of grasping the handle or body firmly.
The conductivity detectors which taste the acrid currents of human sweat. It notes the effect of grasping the glass, with sub-sensible levels of electrical activity.
Then an enormous current passes through the cup and through the aqueous moisture of the hands, and blown through nails on window panes and leave a blasted, roiling stew of rubber boots.