I specially like the concept of "separation of money and state".

If you think about it for just one second, it's just like in the past and ultimately unavoidable. Some time ago we did the separation of the church and state, even though for a long period of time that was something unimaginable. Now's the time for money...

EDIT: I have been since using this analogy when explaining Bitcoin to new people, and let me tell you, it just clicks with everyone, even before they understand what Bitcoin truly is.