Crushing a can is the cheapest demonstration in physics, and it is not the one most people think. A can crumpled underfoot is just metal yielding. The interesting version uses a small amount of water boiled inside an open can, which fills it with steam and drives the air out; seal it or invert it into cold water and the steam condenses in an instant, leaving almost nothing inside to push back against the atmosphere.
The can collapses because the air outside was always pressing that hard and normally had an equal push from within. Nothing pulls it in. That is why the demonstration is used to teach pressure rather than strength of materials, and why it is worth doing with a pair of tongs rather than bare hands.
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The main difference between Europe and the USA