Well this is something basic i just threw together :P basically its a house, pull the lever at the end of the hall (near the bathroom) and the house self destructs

i usually do this when i make a house so if i dont like it i can pull the lever and start again (usually the area is enclosed in bedrock)

place in this directory please :D (for windows 7)
C:Users (Your User Name) AppDataRoaming.minecraftsaves