The person above will ask you something if you notice a thing, and you will answer it by saying yes or no, unless you want to expand your respond by adding something. After you answer, you will say another "Did you notice" question so the person below you will answer it, and so on. You can also add, if necessary, other words such as "Did you --->ever<--- notice..."
Example:
Person 1: Did you notice that I comment a lot on the game, "Mind Bender"?
Person 2: Yes, you go there everyday.
Did you notice that I am a Gold Serf?
I start...
Did you notice that you are the second person to post in this thread?
