A user will say either "NOW" or "THEN" along with a word, sentence, or phrase of any kind. The replying user will respond with the opposite "THEN" or "NOW" respectively with a sentence responding to the previous user's sentence. And then the user will come up with a "NOW" or "THEN" statement of their own.
Sample
User #1
NOW: Nintendo Wii U
User #2
THEN: Nintendo 64
THEN: Cheat Codes to Unlock Secrets
User 3:
NOW: Secrets costing money to unlock.
THEN: iPods...
and so on.
Let's begin...
NOW: Downloading games for PC.