Broken keys in kryptonite locks.
 

These are the long square keys. Here's how to get them out. Put a needle in the lock and turn the wheels counter clockwise until they stop and are all aligned. Then whack the hell out of the lock. Two I worked on popped right out. The other one I used a pocket knife to make the key fragment a bit pointy then it popped right out. If this does not work DON'T PANIC The lock may still open if you turn the key fragment clockwise. The new lock is well designed to collect dirt in the key way.