To the rest of your brain, built up to code with the law of the jungle, when you perceive the possible consequences of blowing a speech, it's time to run for your life or fight to the death. If you kn...To the rest of your brain, built up to code with the law of the jungle, when you perceive the possible consequences of blowing a speech, it's time to run for your life or fight to the death. If you know what you're saying, you'll feed off the crowd's energy instead of letting your hypothalamus convince your body it's about to be lunch for a pack of predators.