I think I've read before that aspies have trouble faking their expressions, or so I heard. I can't just smile when someone else greets me, or smiles at me, I just find it extremely uncomfortable, psychically and emotionally I mean. I only smile when I'm genuinely happy or if I find something funny. It actually kind of hurts to fake smile for me, it just feels like I'm stretching my mouth, but not displaying happiness. I rarely smile when I'm taken photos of.