Go into any level that has a box you can throw at a wall. Pick up the box and throw it head-on towards a wall. Long jump in front of the box up to the wall and as soon as the box hits the wall, pick up the box. If done correctly, the box will break and you will have a new box in your hands. As soon as you throw the box, it will just disappear.
Submitted by: Mitchell VanRassel