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don't throw snowballs unprovoked in to the face of strangers, even if you are a cute little 6 year old girl. Unless they actively encourage you to start a snowball fight with you, don't.
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when a stranger you've just thrown a snowball at politely asks you not to, please don't do it again.
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if you do decide to ignore point 2 above don't be surprised if the stranger throws a snowball back at your face,
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do not sledge directly at someone at high speed and completely out of control.
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especially if you are 45 and your kids are standing around bored while you dominate use the sledge.
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do not demolish someone else's snowman lovingly crafted with their children so you can take the snow and build an even bigger and ever so slightly obscene snowman.
That is all until I can think of more to whinge about