Minecraft Furnace Bomb Trap

This is a easy furnace bomb trap, and you could use this anywhere and in many different designs. Also as always I made this asap (as SIMPLE as possible).

Step 1: Step 1: Blocks Needed

Just follow the pictures. (1 furnace, 1 observer, and as many tnt you want)

Step 2: Step 2: Assembly

First dig a hole, one you can hopefully get out of, then put the observer with the large white dot side up, then just follow the pictures and do as they do. :) (don't mind the black hole/thing?)

Step 3: Optional Step 3: Test It

Just put some fuel and something to cook in and it'll blow you sky high! Also you were done last step. . . so if you did this step, restart :p. (im not gonna change this). Now then, go use this and trap everything of your enemies. :3