The bond between apes and men is sometimes the hand on the face:
"The gesture rarely lasts longer than a few seconds, so it is not easy to see, yet once [primatologist] Wallis told the audience what to look for, the muzzle wipe was clearly evident. Nervous baboons could be seen constantly putting their hands to their faces in difficult situations. She noted that monkeys make a similar move and that a chimpanzee will often put its wrist to its forehead in similar contexts. . . . Humans do put their hand to their face when nervous, and indeed, as she pointed out, psychiatrists and law enforcement officials often interpret a hand-to-face gesture as evidence of uncertainty or even deception."
Further political reflections here.