Sometimes I do think he is trying to drive us crazy. DH does react sometimes when he carries on..but usually is pretty good. I tried redirecting him a lot which worked most of the day. It's always during an unstructured or uninteresting time it seems (at least the noises and the spitting). I have thought about it being a tic or something...but it's not that constant and he knows full well what he is doing and laughs about it. We have a psychologist who did his testing and met with him regularly for days...but he never did anything like that when we met back in March. She felt, and we felt, that he was advanced socially and very mature. He could still act goofy at times, but wouldn't do it during academic stuff at all. I do think its a phase, but a very strange one. He has had other little issues in the past that randomly resolve, so I am hoping this one resolves itself soon. Only time will tell.