This short video illustrates a simple procedure for forcing open standard padlocks with a shim snipped out of a tin can. The technique is old, but this is a good, lucid explanation of it. Kids have been doing this for years, but schools and gyms still recommend these broken locks -- and the manufacturers keep making them, which is practically criminal negligence. Link (Thanks, Kevin!)
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.