The Sky is falling

There seems to be one in every group.
The one I call Chicken Little.
They're the ones that run around crying the 'the sky is falling, the sky is falling'.
The ones that like to spread rumors, especially those that are upsetting to some.
They like to see if they can stir up a group. "We must band together or the evil (fill in the blank) will change our world as we know it and cause us harm".

There are the ones at work, sport groups, service groups and social groups. They love being the bearer of bad news.The biggest defense against that kind of person is to know who they are by past behavior.
Who are the Chicken Littles in your life?