Palindrome or Flatline?

Every so often, whether you're playing telephone or TeleFictionary, something happens.  When you get to the end, you're right where you started!  The input and the output are the same.  Nothing has changed.

In a game of telephone, that's a telephone FAIL.  But in TeleFictionary, it could either be a palindrome or a flatline.

In a palindrome, the interpretations drift away from the original sentence, only to return by the end.  The palindrome can be read from top to bottom or bottom to top without any significant difference.

In a flatline, nothing ever moves.  The interpretations never really change.  The beginning, middle, and end are the same.

Here's an example of a palindrome.  
(note: Colbert is the family cat.  Snaggletooth is a local stray with extra toes.  They're both all black)

I've posted a couple of Telefictionary Flatlines after the jump.