A Bicycle Lock That Tags The Thief
This is awesome. I have to get one of these locks although it
doesn't appear that the lock is in manufacture yet which is a
shame.
The lock contains a pressurized dye that is both visible and
detectable with forensic equipment. The designer's home page can
be found at
http://www.mikelambourn.com/smartlock.html
and I've also linked a YouTube video of the lock in action.