"Which member joined on this date?"
Basically, a well known member is chosen by the host, and their join date is posted (e.g. 26th January 2007). However, the member is not named. The first person to match the date to the correct name wins.
Very few, if any, active members joined on the exact same day as each other. I think it's a good idea, and you can't cheat with the search function, either.
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