If you have a beer and a sheet of paper, there is no reason to be thirsty.
Of course it's always easier to just use the bottle opener on the bar (yes there is a vise on my bar top, which is actually an old work bench made in the 50's by the home's original owners).
This is really more of a party trick... But there are plenty of other things you can do with a sheet of paper. This is a good demonstration of the strength of paper with just a few folds.
I'm certainly not the first one to do it. I saw someone do it over 20 years ago and I am sure plenty have done it since.
(also... Yes I have a flask that holds a half gallon. I found it at Goodwill)
Step 1: Fold the Paper in Half
You want crisp folds. There is more strength. Also, you'll want to end up with a lever with the folded end up. So plan accordingly.
Step 2: Important
Make sure the fold is up... Otherwise it will just crush.
Step 3: First Try
Hold the bottle tight. I like to place my "lever" on my thumb so I can put upward pressure on it.
You can see that in the paper vs. steel contest the paper holds its own.
Step 4: Success!
Second time was the charm.
These are stills from the video. You can see the bottle cap flying off.
I suppose I should add another step and say drink... But I assume you have figured that out.