Here's footage of a vicious and terrifying prank from a Brazilian candid-camera show, in which victims were put in an gimmicked elevator whose lights went out, allowing a small girl in horror-makeup to sneak out of a hidden compartment and "appear" when the lights came back on, ready to scream at them.
Terrifying ghost-elevator prank
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.