How Fast Can I Get Punched?

What is needed:
    A smart mouth
    A certain cavalier attitude about one's own mortality

How to play:
    Very simply, every time you say something to someone, end it with "jackass."
        "How are you doing today?"
        "Just fine... jackass."
    Keep going until you are punched... or dumped.

Tips for gameplay:
    Easier to win when said in biker bars or to your boss.