In this game posts alternate a question and an answer. If the last post is a question, you post an answer to the question. If the last post is an answer, you post a question that the answer would be applicable for (like in Jeopardy).
Sample:
Q: What should I have for dinner tonight?
A: Tacos!
Q: What gave me an upset stomach at Taco Bell?
A: Too much hot sauce
etc...
And let's do the no more than one in five posts thing here.
Question:
What did I do last night?