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The rule of snow is the rule that a pretty girl will always look twice as pretty when it's snowing outside.

Usually only happens when the snow is falling softly, not common in blizzards or other similar conditions.
Person A: I already knew Molly was a gorgeous girl but yesterday it was snowing and when I saw her standing outside she took my breath away!
Person B: Gotta love the Rule of Snow.
by Grape-Chan February 24, 2013
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