I have seen this game used to great effect on other online forums. Basically the way it works is someone asks a question and you can only answer with another question which somehow relates to the one just asked. Like this:
"Who are you?"
"Why do you want to know"
"Is it your business"
"Is it yours?"
And so on. So the first question shall be:
"Why do we all love Grim Fandango?"
So answer with YOUR questions!