Guys. I hate to break this to you, but you did not invent the facepalm.
Not by a long shot.
Dismay, regret, anguish - they've been with the human race for a long, long time. It's instinctive in those situations to cover your eyes so you can't see, to cover your face so you can hide in shame. When Adam and Eve got exiled from the Garden of Eden, don't you think there was some serious facepalming going on?
And the moral of the story is:
And there you have it.