Balloon Boy: "We Did This For The Show" - who is laughing?

Hours after he worried America sick into thinking he was on a runaway balloon flying over Colorado - while he was just hiding in the attic - 6-year-old Falcon Henne, aka "Balloon Boy", appears with his family on "Larry King Live."

In this scene, Falcon admits that he heard his parents calling him, but declined to come out of the garage. At 0:40, he mutters, "We did this for the show."
This leads father Richard to try and explain what he just said. "Whenever we tell him things like, it's a bad thing t do, he does go and hide," he says.