Sometimes you're so dumbfounded by something perceived to be incredibly stupid that you react by cradling your face in your hand to hide yourself from the stark reality of the current state of your existence.
I make an obvious joke with this one. I did throw the last line in as another joke to try and salvage the obvious joke, but your mileage may vary. It was for last week's hour long animation challenge with the theme of FacePalm. Took an hour and a half for the main animation, then another couple hours for the background and other elements last night. Most of this was done within that first hour, though.