Simply tap on your own screen, and haptic feedback mechanisms in the watch will transfer the gesture to the wrist of your friend.
But now I have to go find a haptic curator to do battle with.
haptic House is based on the concept of “sensory play,” which encourages children to look, listen, touch, and feel.
"pertaining to the sense of touch," 1890, from Greek haptikos "able to come into contact with," from haptein "to fasten."
haptic hap·tic (hāp'tĭk)
Of or relating to the sense of touch; tactile.