Kids have no idea how lie detectors work or how they actually look. This is an evil plan by Jimmy Kimmel to get truths out of kids by making the machine buzz and the lights flash when they give an answer. They have no idea that they are just pressing the buzzer regardless of they are telling the truth or lying. Kids are so adorable when they try to lie, they are no way as good as adults. Kimmel has been known to pull pranks such as this, but this one has to be one his best.