Okay, I don't know if this has been done b4 but here is what I am thinking:
You type out a phrase from a pop culture movie, book, game, song, internet phenomon etc. and the next person to post must name its origin and post their own phrase. So, If I were to say 'All Your Base are Belong to Us' the next person would say 'Zero Wing' or you could probley get away with: 'The Lasiest Men on Mars'. Thats about it, If this idea sucks, oh well
You don't have to name the year or who said it or anything unless your an uber geek and want to :p
I'll start the ball rolling with a real easy one to see where this leads:
'I fart in your general direction, your mother was a hamster, and your father smelled of elderberrys!!!'