In my experience persons living together in difficult circumstances (e.g. close friends, family members) often develop the ability to relate to the other person's non-verbal cues. 

For instance; A spouse may go shopping with a list in hand prepared by his partner, and return with a few items not mentioned on the list - only to have his partner indicate one or more items were missed by oversight. Similarly roomies at hostel may merely by a glance communicate an unspoken understanding of intent & action. 

Understandably such incidents probably do not occur with high frequency. They are, however, not totally rare either  - which leads me to wonder whether such non-verbal communication may be taught rather than acquired?