Old Wenger SAKs had a can opener based on that principle giving the whole thing a bad reputation. They did their homework and the current ones perform admirably leaving a very clean edge,and not the remarcable mess of the old ones. Some folks still remember the old ones and stay away from Wengers

Re canned beef, a good many years back, I had the questionable pleasure to feed on that disgusting stuff for almost half a year.Nothing helped to mask the taste, no fried onions, garlic, tonnes of "spices", nothing. The joke went that if by misfortune you run out of grease for the bearings in your vehicle, you can allways fill the gun with .... hmmm.. that thing.