The Great Exhibition of 1851 -- arguably the first World's Fair -- featured this masterpiece of locksmithing. The Aubin Trophy was a demonstration of 44 different locks, each of which could be turned separately or with a single master lock. One of them was made to that if someone tries to pick it, the thief will be harpooned.
The first minute of the video demonstrates the features of the Aubin Trophy. The rest is concerned with other marvels of Victorian Era locksmithing. Link - Thanks, David Eaves!