I know a couple people that won't deal with spiders, or anything spider, because of the wobble. Though I have a normal who does some weird things every now and then. There are times he'll be in his cage and look like hes bobbing his head to music. His head will sway back and forth just slightly, but he does it for about thirty seconds to a minute at a time when it happens. Doesn't happen very often, but it does happen.