yeah the spk's buckles are bottle openers. i've used it and it works well. if you have a lighter you can also use that as well as the edge of a table as long as it is a 90 degree angle, then all you have to do is slam your wrist and pop goes the top.
Just use the keys itself ... or another closed bottle (with the side of the cap) ... once I´ve opened one with the ski (has a good leverage effect) ... basicly you can use everything that has a stable edge