Which country's Emergency Alert System siren is the most alarming?

The Emergency Alert System (EAS), was introduced on January 1, 1997 as a replacement for the Emergency Broadcast System (EBS). Before EBS, an emergency broadcasting system called CONELRAD existed. The EAS is a warning system in the United States which enables the president to broadcast an alert through all radio and television stations, in the case of a national emergency.  — Read the rest