San Francisco Anti-Bike Theft Vigilante

Watch this video, skip to 20s and start.

Two things to think about...

1. Don't use a shitty lock - if this thief is similar to those in Singapore, then you have to think of it this way - if they can get only one bike, will they spend their time hunting down one that has a massively steely lock, in broad daylight where people frequent?

2. After you chase the thief away, what do you do?