Anything you do because you think it will make you look cool will invariably make you look arrogant or stupid. The things you do naturally as an organic outgrowth of who you are are what people see as "cool."
Of course, now that you have read this, nothing you do will be natural because you will have this notion of purpose in your head even without trying to. This makes this post the cultural hipness equivalent of telling you that you just lost The Game.
Which, by the way, you just lost.