The fast food chain says the world’s first ‘French Fry Security System’ will stop greedy diners in their tracks. We’ve all been guilty of stealing a chip or two from the plates of dining buddies when we’re feeling peckish. But now McDonald’s Canada says it’s come up with a solution to stop so-called “frime lovers” in their tracks. In a canny promotional stunt, it has released the Fry Defender, an app that turns your phone into a motion sensor. If you activate the Defender, a loud alarm will go off if someone is stealing a chip while you’ve gone to get more ketchup.