A while back in a post entitled "how to run game", I wrote that in essence all you need to do is be is curious about someone else..you just have to WANT to find out who they are, how they got there, and where they're going.
What you need to experience this state is called the "Beginner's Mind".
A mind free of judgement or preconcieved notions.
Only when you see the world as it is, and not as a collection of your past judgements, can you begin to connect with strangers on this very real level.