Have wondered about posting this for a while. My DS is 4 and a half. When he is excited eg during his favourite TV programme, when he saw our Christmas tree, when he thinks about things he is looking forward to etc he does an invluntary spasm with his fingers and fists, twists them round and his arms go rigid for a moment. He is a very confident, sociable little boy and I would say he is very normal in every way but I had always thought he would have grown out of it by now. Has anyone else had experience of this? Should I be worried?