Canned foods are a staple of modern society. Because canned foods don't spoil, they're perfect for camping and/or any kind of survival situation. Canned foods are also generally pretty cheap, which definitely helps contribute to their overall popularity. The one major drawback to them, however, is the fact that unless you've got the awesome pop-top cans, you're going to need a can opener to open them.
Sure, that may not sound like much now because who doesn't have a can opener? True story time: once, I was moving in to a college apartment and it was past the time of night that local restaurants deliver. All I had were some tuna cans, but I had no idea where I packed the can opener! Whatever your reasons are, it's definitely a great idea to know how to open cans without can openers, which is why YouTuber CrazyRussianHacker created this video. By using friction created by running the can on a gritty concrete surface (any sidewalk, etc.), the lid is loosened up enough to eventually pop out.