We could all do with a cool new way to open a bottle. When there isn't a bottle opener to be found, most people just choose to open their bottle with a lighter or something similar, but there's another way, and all it requires is another bottle. Hold the two bottles together with the cap of one underneath the other. Then gently give the lower bottle a slight kick with your heel.
This should pop open the top bottle similarly to a bottle opener. However, it might take a couple of tries to get it just right and learn how much force is needed.