Post your "surebets"

[kemystery]

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not being able to blow a crumpled piece of paper into a beer bottle

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I've never heard of this one before, how does it work?

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the air being blown into the bottle has no where to go so the napkin/paper doesn't budge, (try blowing into a bottle, you'll get nodda)

this one works and is easy to set up for a "Who buy's next round" bet