Linda hides a coconut in a box
Here's a description of the contestant's attempt. Someone's probably working on collecting some images to illustrate it.
Linda’s strategy is to bury the coconut (which she does, in the corner of the square), and then trick Mark while he’s searching for it. When Mark begins searching, Linda informs him that there are a lot of squares around the area where they are (indeed, the task does not specify that the coconut must be hidden in the provided square!). Mark runs around, searching other square shaped areas for the coconut; Linda remarks to the camera that she genuinely did not believe him to be so stupid as to trust her. Eventually, Linda takes pity on Mark and informs him that the coconut is indeed in the provided square. Linda keeps the coconut hidden for 10 minutes 12 seconds, and earns third place.
(Written by Jenny R and proofread by Karl Craven)