the corkscrew's great, you're surviving on the beach/waterfront because there's lots of food to be found, and low, a bottle of chateau la fite 1935 washes up on your beach, which using your sak corkscrew you open and enjoy with your muscels sauted in wine and garlic!
on the other hand they are quite good for digging exploded batteries out of torches and the like!
steve