Here are some cool bartending tricks that you can acquire as a bartender. Once you start becoming a bartender, people will expect you to be able to open a bottle of beer for them even when you don't have a bottle opener. Use these tricks when such an occasion strikes:
How to Open a Beer Bottle with your Ring
How to Open a Beer Bottle with a Lighter
How to Open a Beer Bottle with a Countertop
How to Open a Beer Bottle with Another Beer Bottle
How to Open a Beer Bottle with a Pen
How to Open a Beer Bottle with a Piece of Paper!
And the Best Way to Open your Beer
These are relatively useful tricks to know at a party, and you will definitely be the hero if you're the only one that knows how to do it.
Don't hurt yourself, and good luck trying them out!