In Japan street crime is very low but both bicycles and umbrellas are 'borrowed' on a routine basis. Kind of like an informal bike sharing system. Consequently most bicycles are of the $80 made in China variety.
Here in Canberra Australia I would regularly come back to my bike to find new marks in the plastic around my chain where somebody had tried to cut through. Your chain has to go through both wheels if you have quick release on the front, and you can't leave any clip on lights or your water bottle or it will be gone.
A few years ago I watched a junky go from bike to bike in a bike rack testing each lock to see if it would open easily. Right in plain view of everybody. When I confronted him he launched into some long and carefully rehearsed sob story about how his friend told him to come and get his bike but didn't know which one it was.
