Amir breaks the rules with his hose
Here's a description of the contestant's attempt. Someone's probably working on collecting some images to illustrate it.
Amir lays a tarp on some wooden supports and a barrel, below the watermelon. He tests what will happen using a basketball, while holding onto the opposite corner of the tarp. In his actual attempt, holds onto the tarp and uses the water from a hose to propel the watermelon towards the pool, in which it lands. Because he clearly affected the watermelon after its release, he is disqualified.
(Written by Will G and proofread by Karl Craven)