In Die Hard, Holly McClane berates Hans Gruber when she realises he was after the bonds all along by saying "After all your posturing, all your speeches... you're nothing but a common thief." He responded indignantly with "I'm an exceptional thief..."

Now imagine the scene between Michael and Kay early in part 3.
Kay: "Now that you're so respectable, you're more dangerous than ever. I preferred you when you were just a common Mafia hood."

There was nothing common about Michael's Mafia career. I wonder if the thought would have crossed his mind?