@edgarblythe,
Mackie Messer, or Mack the Knife, a character based on the dashing highwayman Macheath in John Gay's The Beggar's Opera (who was in turn based on the historical thief Jack Sheppard). The Brecht-Weill version of the character was far more cruel and sinister and has been transformed into a modern antihero.
And the shark, it has teeth,
And it wears them in the face.
And Macheath, he has a knife,
But the knife can't be seen.
