I heard the Florida Keys actually did this for a while. They did not like how the US treated them for some reason... they declared independence, had a flag and everything, and then attacked a border soldier with a stale loaf of bread, immediately surrendered, and then applied for aide.
Sounds like it's fake I know, but I swear it was one of those "Sounds unreal, but true." things somewhere.... don;t hold me to that though.