In a 3 word story you copy and paste everything in the story so far and add 3 words to continue it.
Member1: Once upon a
Member2: Once upon a time there was
Member3: Once upon a time there was a boy who
Member4: Once upon a time there was a boy who got lung cancer.
Try not to double post too much and the story can be serious, random (usually the best), or whatever else
There once was