Mostly as a reaction of surprise, when it comes to vocal. I tend to be virtually mute for the most part.
On the non-vocal side and the more physical/action-based things, I pretty much shift every time I go to sleep. Which can get a bit embarrassing if someone wants to take pictures of me and that to catch me in the act. And then pawing at insects / playing with them morbidly.
Then, of course, the common phantom limb feeling, which is pretty uncommonly "complete" (As far as a tail goes), the rest of the time it feels like a growing sensation that seems to not want to come out.