I figured out how to open a bottle cap using my cell phone case, I was proud of myself. What is the best way, portable, or creative, you have found to open bottles?
Rings. I'm married and have a tungsten ring, so it's basically always on my hand. Some bottles don't give you much room to get under the cap, but I can get most anything open pretty quickly.
Best/portable: Bottle opener keychain, most alcohol shops will give you one, there's usually a beer doing a promo with them, just ask them because they probably have a box they keep forgetting to give out.
Cap against edge of concrete ledge. My friends and I bought a bottle of cider at a 7/11 and realized we didn't have a bottle opener. Cue that moment of brilliance from my mate.