During the holidays this past week I pulled out a tin of peaches to serve with breakfast and he asked if he could open them. I agreed, and then regretted it when he pulled out his pocket knife.
However, instead of saying anything I simply googled how to use it so he could finally test out the pocket can opener. I actually pulled up this video via youtube which was a perfect guide.
Then each of the guys took a turn on the can, and soon learned that using a conventional can opener is probably a lot easier unless you're on a push walk and didn't happen to bring one with you..
If you chose to use a pocket knife can opener you'll need to remember the tin and the lid will be quite sharp from the jagged edge all the way around. We poured our peaches in a bowl before letting the kids eat them because there was great concern over someone getting cut on the edge, and personally I think we've had quite enough ER visits to last us for a while...