On a serious note , the way I convince most of my friends to join it is by telling them how they can reap profits from the system rather than convincing them that Bitcoin is a better financial system xD
I disagree strongly with this view, I think educating them on WHY Bitcoin is a better way to do money is MUCH more important than telling them "you'll make lots of profit!", especially given Bitcoin's volatility.
Otherwise they may end up buying in right before a big crash, and then they'll resent you because they have no understanding of how irrelevant fiat price fluctuations are, at this early stage.