What could be the most alarming message to receive on your television during an emergency broadcast?

An emergency broadcast aims to inform and guide people through critical situations, but certain messages had the potential to evoke extreme fear due to their implications. The scariest message might be one that indicates an imminent and unavoidable threat, offering little time to react or prepare adequately. For instance, a message alerting residents of an incoming missile strike or the outbreak of a highly contagious and deadly virus without immediate countermeasures could induce panic. The level of fear is exacerbated by the feeling of helplessness and the urgency of the crisis. In such scenarios, the communication should attempt to provide clear instructions to ensure public safety, even though the underlying message is inherently terrifying.