Whatever it is called, I find it to be great when capturing portraits. When done right, it can bring a boost of dignity to the subject, and a bit of mystery to make viewers wonder that the subject is thinking.
I caught this shot of my son last Saturday morning. From the little "monster" backpack on his back, you can tell he was being his jovial self and playing around, but for just one second, he had this deep look, and I was lucky to have the camera ready in hand to take a quick snap.
Been a bit busy with work lately, but it's shots like this that reinforce that idea that I should at least take a few shots every day, because you'll never capture life's fleeting moments if the camera isn't even on!