The Problem with the Heart

Setting: Max is flipping through the most recent issue of the National Geographic where the feature story is about the human heart. He’s particularly interested in the double-page photo spread documenting the implantation of an artificial heart.
Max (to no one in particular): Now they are cutting him open. Now they are taking his heart. Now they are putting in something… Mom, what are they doing?
Mom: He’s receiving an artificial heart.
Max: What’s that?
Mom: His own heart was no longer working, so they gave him a temporary heart until they could find him another one. (hoping she wouldn’t have to explain that further…)
Max: What was wrong with his heart?
Mom: Gee, Max, I really don’t know.
Max: I know.
Max: He ate too much junk food, and his heart got sick and said “aaa-choooo”.