Humpy Dumpty Sat on a Wall.

From SMBC 2014/06/02 http://www.smbc-comics.com/comic/2014-06-02

Humpy Dumpty Sat on a Wall.
His height was at Y and his mass wasn't small.
Off of the wall he unhappily fell,
And diminished his Y in the gravity well.

All the King's thermodynamicists saw
that Humpty was screwed by their second great law.

All the King's horses and all the King's men
lacked the E to put Humpty together again.

But don't cry for Humpty or Humpty's Big Spill,
for he's gone where the rest of the universe will.