There are times where my body will not stop jerking about - literally. If the inflamation in the nerve tissue in my neck gets really bad, then muscles all over my body begin to twitch. They don't do this violently, and if my arms or my legs begin to do this and I concentrate hard, I can stop it in the limb in question. That said, I can't concentrate on more than one area of my body at any one time, so the rest of the body is still twitching away. It makes writing, typing or any job that requires manual dexterity very difficult.
The joy comes at that point some seconds after the last spasm, twitch or jerk has actually finished and my body is finally at rest. It is almost a divine pleasure to not be moving any more.