Here is an elegant solution to the bike theft problem, an exploding lock! Just as banks insert exploding ink packs into bags of cash, the lock would spray a marking ink all over the culprit and bike when cut, notifying authorities or anyone else that this is a bike thief/stolen bike. You probably wouldn't get your bike back, but at least it would be a pain in the ass for the thief, which is really all you can do. After all, It isn't a matter of - how can I keep my bike from being stolen, its HOW LONG can I keep my bike from being stolen.