For my son he stims, as the Autistic community calls it, by jumping back and forth, back and forth rhythmically on our couches. We say, oh, he's going to his happy place. His words turn into jabbers and screeches, his smile turns as wide as the Cheshire cat and you know he is happy. And we don't stop it, because thankfully when this behavior began over five years ago we sensed that it made him feel good and that's how every parent wants there child to feel, isn't it?