This might be old news to some, but I'll cop to the fact that I had more-or-less zero idea how a key and lock actually works. Something with tumblers and cylinders and somethingorother...
And then, I watched this animated gif, and everything makes perfect sense, and I feel sorta silly for not knowing it before.
Which, then, begs the question: how does lock-picking work? And the answer, from the same artist:
By Stian Berg Larsen [via Gizmodo]
Also, for more gif goodness, check out this mesmerizing animation of a sewing machine in action