This is an amazingly well-done "how it's made" video, all about the process by which aluminum beverage cans get built. These cans are so common that we rarely look at them, but they're a marvel of engineering: to save material (important, when you're making hundreds of billions a year!) they're made almost as thin as paper, and when they're empty, they easily crumple to save space while recycling. Yet when full, they can support 6 atmospheres of pressure inside and are sturdy enough to stand on -- and it only takes a single pull of a tab to change one into the other.+engineerguy
does a fantastic job of explaining the whole story, with everything from example parts to animations that show exactly how the subtle steps work.
h/t +Jordan Peacock
for finding this!