Jacob's happy arms

A little blurb about Jacob. He has picked up two little habits that make me smile. The first one is saying Yep. He says it for yes and I am sure he has heard me use the word before but it has become one of his conversation staples. (Sorry for all you southerners cringing out there). The other is a funny position he puts his arms in when he feels happy? I have tried to decipher what emotion instigates the funny arms but I am still not quite sure. This is a poor photo of it because he wasn't doing it naturally. True funny arms go straight out from the shoulders and then make a 90 degree angle at the elbows to let the forearms dangle vertically.