Lighting a glass with a little bit of Sambuca in it on fire, putting your hand over it to extinguish the flame, and when the flame goes out, the decrease in air temp creates a strong suction on your hand, strong enough that you can shake your hand all around without the glass coming off. Great for freaking people out.
How it works:
The suction is created by a vacuum in the glass. The flame is fueled by oxygen and goes out when all of the air has been consumed by the flame. With no air left you have created a vacuum.
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