All hail the YouTube algorithm for bringing this four-year-old video to me.
There isn't much too this demonstration. The thin aluminum top of a pop can is pressed upon back and forth a few times, and the can tab 'explodes' outward...loudly.
I assume this works because the designed failure point around the can tab is relatively weak - weaker than the rest of the solid top - and the pressing back and forth on metal stresses that point causing the failure.
Neat trick and one I think I'll give a try.
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