Mel Gibson May Be Insane

This is a clip from Mel Gibson's Apocalypto. In it, we see what appears to be a whole field littered with dead bodies. Then, for a split-second, a mysterious image appears. What is it? Slowing the video down allows us to see. And either laugh hysterically at Mel's wild sense of humor or cringe with horror at witnessing the true scope of his madness: