Trick To Open Can Without Opener

This method is so simple it’s silly; all you need is a sort of flat rock and the can opens cleanly after some rubbing. Take the three minutes to learn the trick for the next time you forget your Leatherman. To get right to business, jump ahead to about 1:05. —Sean McCoy

[youtube https://www.youtube.com/watch?v=oH2NahLjx-Y?rel=0&w=560&h=315]