Claw hammer. The front bit is used to hammer in nails. The back bit is used to take out nails. It's a claw with which you can grip a nail that sticks out. Now, if you use the clawed bit against an object you're guaranteed to do a lot of damage. And the intrepid young man in this picture is about to demonstrate just that: how to destroy a CCTV cam with the back of a hammer.
I'm sure the 'after' picture was hilarious too.