Actually that happened, first cans were steel and soldiers had to use their knives to cut it open.
I have a P38 on my keys.
We made this sweet ass thing we call a can to hold your spaghettios. Great how do I open it.......
Imagine having to have a metal straw and poke it through your can of corn 😂😂
Which came first - the can or the can opener???
it would be really weird if can openers were invented before cans.