How to break a beer bottle with your bare hands

This deadly (well almost) kung fu do technique demonstrates how to break a beer bottle with your bare hands, so that only the bottom of the bottle will pop out.
The secret to this trick is all around us, yet you cannot see nor touch it.

Fill bottle with liquid
Fill the bottle with water (or any other liquid) up to about two inches from the top of the bottle.

How to hold the bottle…
Hold the bottle with your weak hand (in my case, it’s my left hand) just under the collar, with your top two fingers…
This is to prevent the glass from cutting you in case the entire bottle shatters.

Hit it!
Hit the bottle with the fleshy part of your strong hand (the palm). I have also seen it done with elbows by kung fu masters.

Voila!
If you hit it hard enough, the bottom of the bottle will pop right off due to the air being trapped and compressed inside the bottle.

Some beer bottles are harder to break than others… start with Becks, then progress to Budweiser.
I have seen footage of kung fu masters performing this trick with bottles of wine!