Opening a presentation with shocking facts immediately grabs the audience's attention, compelling them to sit up and take notice. It disrupts their preconceptions, sparking curiosity and interest in the topic. Shocking facts evoke an emotional response, making the information more memorable and impactful. They set the stage for urgency and action, prompting the audience to consider the significance of the issue at hand. Ultimately, using shocking facts as an opening method can effectively engage listeners and drive home the presentation's key message.