Cyclists all know that SF has a bike theft problem. And even when cyclists use expensive u-locks, those can quickly be cut with angle grinders — a fact which many know all too well. Faced with this distressing reality, a local engineer came up with a unique solution: a "bike lock that Fights Back." Say hello to the Skunk Lock, a u-lock that has a pressurized vomit-inducing liquid inside that, if cut, sprays all over a would-be thief.

For the full aricle go here: http://sfist.com/2016/10/21/sf_engineer_designs_bike_lock_that.php?...