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Actually that happened, first cans were steel and soldiers had to use their knives to cut it open.

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.