Oh boy!
The only one I experienced was Sugar Hill, Georgia's Sentries going off accidentally on the day of the SWA drill in 2014 at like 6:10 in the morning if memory serves me right. I did catch an audio recording on my old iPhone 4S. If I run across it I will upload it.
For historical accidental activations, Atlanta was pretty much a ten a pen deal. I'll probably elaborate on them later.