I got the Idea of this game from listening to Bicycle Race by Queen. It's fairly simple from what you see in the last persons post just put down something related to it that 1st pops into your head
E.G. 1st person: You say black
2nd Person: I say white
You say dog
3rd person: I say bite!
You say shark
and so on and so on like that I'll start off:
You say: car