this is my first instructable by the way so I made a simple amusing one.
Anyone who put's grandad's eye out or anyone else's eye out or damages them in some odd way with idea takes full responsiblity by using this information to create the item and effect ilustrated
Step 1: Put the Bottle Under Pressure
Step 2: Firing the Cap
another variation is to leave that 2/3 full fizzy drink for a little bit longer and flick the cap off, you'll be left with vapour flowing out of the bottle.
2/3 full bottle of fizzy water? shake it hard for 30 seconds and fire, it sounds like a gunshot and the cap will have much more velocity than the others
also if you're getting a drink it looks really cool to spin the cap off into your hand (this one is for still drinks