What is a story were the main villain actually turned out to be the good guy?

Some Guinness was spilt on the barroom floor, when the pub was shut for the night. Out of his hole crept a wee brown mouse & stood in the pale moon light. He lapped up the frothy brew from the floor, then back on haunches he sat. And all night long you could hear him roar, "Bring on the goddamn cat!

• Irish poem