Mystery of the Half Eaten Watermelon Triangles

It was my birthday on Friday and over the weekend we invited relatives over for brunch. My wife cut watermelon - perhaps my son's most favorite food ever - into triangles and left them in a bowl. Before we left, my wife called me in the kitchen to show me that the tops of all of the triangles had been eaten, but the bottoms had been untouched. It was slightly frustrating because we obviously could not serve the watermelon, but it was hysterical, too, when we realized our four year old had been the eater! So funny.