Cell-phone creep lens

The Photojojo Spy Lens lets you photograph subjects at a 90° angle from the way your phone is pointing, so they won’t be able to tell you’re taking a picture of them. It would be easy to play it off as a harmless toy, but the manufacturer’s own pictures show it being used to take a picture of someone on a public bus without their knowledge, as well as someone hanging it around the corner of a locker room, complete with creepy grin.