UI fail

Around 8:05 a.m., the Hawaii emergency employee initiated the internal test, according to a timeline released by the state. From a drop-down menu on a computer program, he saw two options: “Test missile alert” and “Missile alert.” He was supposed to choose the former; as much of the world now knows, he chose the latter, an initiation of a real-life missile alert. […]

Around 8:07 a.m., an errant alert went out to scores of Hawaii residents and tourists on their cellphones: “BALLISTIC MISSILE THREAT INBOUND TO HAWAII. SEEK IMMEDIATE SHELTER. THIS IS NOT A DRILL.” A more detailed message scrolled across television screens in Hawaii, suggesting, “If you are indoors, stay indoors. If you are outdoors, seek immediate shelter in a building. Remain indoors well away from windows. If you are driving, pull safely to the side of the road and seek shelter in a building or lay on the floor.”

As John Gruber of Daring Fireball puts it, "this is just terrible, terrible user interface design."