Steve-O (Jackass) is strapped tight in a port-a-potty toilet (dixie) suspended from rubber bands attached to two cranes. The toilet is skyrocketed transforming the stored spring energy into velocity (kinetic energy) and then in gravitational energy. Nice touch (not for Steve-O): for a few moments we witness weightlessness. You will observe some strangely shaped brown objects floating through the confinement where Steve-O is strapped in. At the end of the video also see the images shot from above, which also are very worthwhile.
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