Asks Ralph, and submits this this splendid article to get the ball rolling:
A Texas man was wounded after he fired a gun at an armadillo in his yard and the bullet ricocheted back to hit him in his face, the county sheriff said Friday... The animal's hard shell deflected at least one of three bullets, which then struck the man's jaw, he said.
They couldn't find the animal afterwards, so I suppose it's possible that he missed all three times and the bullet which hit him had actually richoted off some other hard surface, but hey, that's not such a heart warming tale.