http://lifehacker.com/open-a-can-with-a-spoon-604552744just push down with the tip of the spoon against the inner edge of the can and start rubbing. In a short while you'll penetrate the lid and you can carve around the can with the spoon's edge.
I have seen this but never tried it. Some of these things look easier then it really is. I saw a video on opening a can with a spoon. I never got it to work, I bent a few spoons, tried different cans. One of those things that practice makes perfect.
that's very similar to the butterfly type can openers I have, we can buy several for £1.You can get a military P38 or P51 can opener for like a buck. No reason one shouldn't be in your pack. Though personally, I have something more like this, because I'm lazy: https://www.amazon.com/Yaheetech-Qu...58389&sr=8-17&keywords=can+opener+for+camping
which is back to the female I spoke about.lol.Don't know why I'd ever be without a knife or my Leatherman. Whenever possible I buy can food with a pull tab.