Less than 500 MPH: You take 1 sip.
500-525 MPH: Others playing take 1 sip.
526-550 MPH: Others playing take 2 sips.
551-575 MPH: Others playing take 3 sips.
576-600 MPH: Others playing take 4 sips.
600-700 MPH: Others playing take 5 sips.
700+ MPH: Choose one person to take 8 sips.

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http://www.wiiarewasted.com/games/spankthemonkey.html