When I got to college the recommended anyone with a bike buy a U-lock. When DH started riding on the cycling team one of the members lost their keys to their campus beater's lock and another member was ready with a website that had instructions on picking the lock. Being an honest guy, he only gave the website to the person without the keys and did not tell everyone in case it sparked any ideas in someone. Unfortunately, this means the instructions to pick a U-lock are circulating the web.