EFFECT:
Make the bottom of a beer bottle pop off.

Get a standard 12oz beer bottle and drink about 1/3- 1/2 of the beer.  Hold the beer like you normally would with your catching hand (opposite of throwing).  Raise your throwing arm and pound the hole where you drink from with your open palm as hard as you can.  If done right, the carbonation from the pressure of the 'slap' will cause the bottom of the bottle to blow out!  This is alcohol abuse... Use this trick before bar close!

it DOES work.

Click here to see a video of this trick in action.