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gorilla arm

gorilla arm: n. The side-effect that destroyed touch-screens as a
   mainstream input technology despite a promising start in the early
   1980s.  It seems the designers of all those spiffy touch-menu
   systems failed to notice that humans aren't designed to hold their
   arms in front of their faces making small motions.  After more than
   a very few selections, the arm begins to feel sore, cramped, and
   oversized --- the operator looks like a gorilla while using the
   touch screen and feels like one afterwards.  This is now considered
   a classic cautionary tale to human-factors designers; "Remember
   the gorilla arm!" is shorthand for "How is this going to fly in
   *real* use?".