Hello,
My name is Andy_34. This is a System I thought of playing Minecraft. As soon as someone removes any Chests or other Blocks in this dummyhome the Sandfloor falls down and the griefer is killed using Tnt. You can increase the damage caused to the griefer by placing lava below the floor instead of water. The Off-switch is well hidden using my Redstonetorch trick. Place a torch below the ceiling at the right spot and (without feedback) the System is turned off. It's perfect to protect your base on a multiplayer server from being griefed.

Comment if there are problems (I can read!).
Upvote if it's working.
Also comment when using the design in your world or have ideas for improvements.
thank you.

bye

Credit:
http://www.minecraftforum.net/topic/127377-16x-32x-64x-128x-256x173-lb-photo-realism-another-update-for-the-x512-72911/
http://www.minecraftforum.net/topic/140684-173-toomanyitems-in-game-invedit-july-1/

Additional Notes