OK... I'm literally just inventing this now so I don't think it's a traditional forum game.
Basically, you simply reply to the person above saying "Yes" or "No" then post your own "Did you know...?".
Try to make it interesting, maybe a weird fact, maybe something you didn't know but have found out today, maybe something in the news, anything. You'll get the hang of it quite easily.
1) You must try to ensure that your "Did you know...?" is totally factual.
2) You should keep it clean.
3) Don't make it personal, especially things about other forum members!!
If in doubt... don't post it. Choose another.
Hopefully we'll learn loads of new and yet totally useless stuff in the process. :)
Did you know that John Prescott is 69 years old?