Just found this little Gem (inspired by the Twilight Zone find's mention of CONELRAD)... Its from a Fort Wayne station (WOWO) in an accidental activation of the Emergency Broadcast system in 1971... about 20 seconds in you hear the activation message, followed by the poor news announcer spending the next few minutes basically filling in air despite having nothing to say, followed by an explanation as to what happened (Someone put the "Actvate" tape in the originating transmitter at Chyenne mountain, instead of the "Test" tape)
http://historyofwowo.com/audio/WOWO-Bob%20SieversEBS_02-20-1971_scoped.mp3
Here's the scary thing folks: If this was a real emergency, you might not have known about about it! Many stations either ignored the activation, didn't know what to do, or didn't get the activation.
More on the activation here: http://conelrad.blogspot.com/2010/09/code-word-hatefulness-great-ebs-scare.html