The title really is pretty self explanatory; you simply post whatever comes into your head about the user above yourself. I don't take credit for this, I imported it from Virtual Teen.
Here's an example:
User 1: Has a very long username.
User 2: Is observant.
User 3: Finds him observant when in fact he is stating the obvious.
Et cetera. Let's see how this goes. Testing editing functions.