So after setting it up, you'll want to cover all the pistons and redstone, so that the only thing showing is the bait. After doing that, go and set up some signs saying to stay away. This makes sure only the greedy people go for it. It may look done, but we still haven't added the key part...the trap! This part is optional, as you can decide to make the person fall to their death and pick up their things after they die, or make them fall into lava, burning all their stuff.