Here the first person will post a question about a favorite or something else, then then the second person will answer it and post a question of their own! Here's an example:
Me: My favourite book is "Dune" by Frank Herbert. What's your favourite book?
Next Person: "Blah, blah" by So-and-So.
My favorite color is purple. What's your favorite color?
And on and on it goes!

Well, my favourite book really is 'Dune' by Frank Herbert. So, what is your favourite book???