This is one of my favorite faces my mom makes.  When you tell her to smile for a picture, she does, for like a half a second.  Then you snap the picture and you miss the smile.  So you have to do it again.  “Smile mom.”  She does it, but by the time you take the picture, back to neutral face.  So this goes on about 5 or 6 times until she finally says, “I AM smiling Matt,” and makes this face.  The best.