iDeas Anyone?

I am gathering data on this project am working on. Please send me an email or comment on the following:

What list of puzzles/questions/task would put before soon-to-be-married couples to check how compatible or how well they know/understand each other?

Please send answer through my comment or send to datchild@gmail.com

On the lighter side: what is the most obvious thing about you that everyone that knows u know?

Anyone with the correct answer wins a prize.