My friend introduced this to me a while ago. I've tried it on another forum before and the story ended up going on about all sorts of random nonsense.
Basically, each person types 3 words for a story, the next person will the continue that story with 3 words and so on. You use the grammer, so if there's a full stop, start the next sentence etc.
E.g. The once was a pancake warrior who went walking... You get the picture. (Colours show the different people)
Once upon a