I'm serious, just do this:  Set a timer for five minutes and write.  Write write write.  Don't stop.  Just write what comes to mind.  If nothing comes to mind at first, write "I have nothing to say" over and over until something comes to mind.  I promise, something will.  

Don't stop to edit in any way.  Just go go go.

Then put it away for a while.  Overnight, or a couple of hours, at least. Then re-read.  Were you surprised by what you wrote?
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