The quickest way to learn about a person

The inspiration.. 
If you are not particular with a person let him play the way he wants during the game.

Quote of the day.. 
You can discover more about a person in an hour of play than in a year of conversation.

--Plato
Other idea... 

The ideal and quickest way to discover one's personality is through a physical and mental play, let him behave the way he wants.

Firming question..
How do you reveal yourself in quickest way?