This could be very handy in a situation where you realize too late you have packed all sorts of canned foods in your Bug Out Bag but forgot a can opener. Doh! Or just when your toddler is going through this phase where he likes to take random things and hide them in his Buzz Lightyear backpack.
This one is using just a soon:
This one you can do without any other tools. He does use a knife in it at the end once the can is opened but you could figure out something else to use if you didn’t have a knife.