Algodoo

Based off of the final trap in Saw V.

Not as stable as I`d like it to be, but it will have to do.

Close the door of the box with some amount of force, and it will move into the ground. In a perfect world, the walls smash in when the box is completely in the ground. Unfortunately, that doesn`t always happen. If it does, just try the scene again.

The walls are pulled together by a spring, I didn`t make it an engine for two reasons.

1. I really didn`t feel like making another pin-activated motor.

2. The walls wouldn`t come together right if there really was a person in between them and the only thing pulling the walls together was a motor at their base. A motor at the top would have been necesecary to get them to come together evenly.