This is more than a little scary... Seem mechanical locks have a fatal flaw. All of them. Think about it. ALL your locks, your security, etc. all can be opened in seconds.

The problem is the Bumpkey. It uses a shortened version of a modified key blank. You insert this into your lock, then "bump" it with a sharp tap as you try to turn the lock. This has the effect of bouncing the tumblers, as they settle, the bumpkey spins the lock body. Open. Done.

Here's a vid. Scary stuff.