Chain reaction: poster 1 posts a word. Poster 2 then posts a word that is relevant, a synonym, or a word that can be joined to word number 1 to make a longer word, and so on. Like so:
"Cave"
"Man"
"Made"
"Tool"
"Building"
"Tower"
"Tall"
Just an idea, that's all. I have to admit I was surprised that the off topic section didn't have forum games. Thought I'd liven the place up, 'know what I mean.