I have one too many personalities,
I don't know which one is really me,
So if I'm nice at first, and then I'm mean,
You just met Sally, and then met Steve.

Yes, it's strange, but don't be alarmed,
Steve and Sally cause no harm,
Neither does Sarah, or Sammy, or Stu,
But Darwin and Devin and David sure do.

Be cautious around us,
The villains I named,
You won't know who's who,
We all look the same.

Source: http://www.familyfriendpoems.com/poem/if-four-is-a-party-this-is-a-parade