[tugs]

Check out the jitter if you leave your mouse just to the left of the hand.

[ferongr]

This doesn't happen in Firefox so I'd assume it's a bug of the browser.

[davorak]

Worse in Firefox then in Chrome for me. I can not get a continuous jitter in chrome at all but easily get the button and hand to jitter continuously in Firefox if I leave the mouse at the right spot.