Possible Clues:

• Be agitated when it's three times the figure entered
• Shiver slightly as with cold
• R.E.M. belt out rock
• ...it should wobble three times as much, with added mass
• Shiver with fear
• Minute into really stiff drink, get the shakes
• The way more than twice about a thousand is enough to shake you
• Choirboy about to open Mass appears to shake
• Look nervous as chorister in Mass? The opposite!
• Shake - quiver