That fucking "Quest For Fire" face is my all time favorite.........when I first saw it I don`t think I ever laughed that hard........once I contained myself,around 10 minutes later I`d start cracking up again......rinse, wash,repeat.
Fucking hilarious......,my abs got sore! 
It's my favorite photo to ever come out of this place. I still laugh and wonder why he thought it was a good photo, and what he was doing, thinking about, looking at, to make that face. An Oscar winner couldn't come close to mimicking the emotion in that face. Fear, stupidity, awe.... It's all there.