You will need:
One 50p piece, 1 Pint beer glass or similar size drinking mug.
Balance the 50p on the rim of the beer glass.
Challenge your friend to blow the 50p directly over the diameter of the beer glass without the 50p touching the glass at all. Blow down on the coin, on the side that hangs over the outside edge of the glass. This will deflect the coin up and forward over the glass.
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