Einar kicks the watermelon
Here's a description of the contestant's attempt. Someone's probably working on collecting some images to illustrate it.
Einar creates a track attached to a walker below the watermelon. He wraps some tape around the watermelon, attaches string to the roll of tape, and then puts the end of the string in a cement mixer so that the string will wind up and pull the watermelon. Unfortunately, when Olli drops the watermelon, it misses the track completely, and the cement mixer rotates a few times before coming to a stop. Einar gets so frustrated that he kicks the watermelon, which counts as him affecting the fruit after its release, and so he is disqualified.
(Written by Will G and proofread by Karl Craven)