PD Bottle Opener

Our 1st assignment is directed towards bottle openers. I have been thinking of different ways to open bottles. How do I open a bottle when I don't have a bottle opener? I thought about opening bottles with lighters, belt buckles, counter edges, with other bottles, even with a sheet of paper. Its basically a lot of force directly on the edge of the cap to pry it away from the bottle, once a small part of the cap is off the lip of the bottle the cap comes off easily.