It bugs me too. I haven't had a chance to make the sort of comparison you have, but it rings true to me. Maybe the blame belongs to film and camera advertisements that created this very strong cultural image of what Family Snapshots were "supposed" to look like?
Originally Posted by mgonzale
Kids, especially, get very strongly conditioned to stop what they're doing and smile for the camera, and it just drives me up the wall. No, dang it, I wanted that expression of concentration you had on a second ago!