This is basically a take on the board game "Scattergories". The idea is to look at five (general) categories and the letter you are working with to build words that fit each category and build the puzzle to completion. Example (this might be the post before yours):

Letter: J

Cities: Juneau (Alaska)
Singers: Janis Joplin
Tools: Jackhammer
Things in a library: Jane Eyre
6-Letter words: Jumped

You might then answer: Letter: J

Cities: Juneau (Alaska), Jackson (Mississippi)
Singers: Janis Joplin, Jerry Lee Lewis
Tools: Jackhammer, Joist
Things in a library: Jane Eyre, Janitor
6-Letter words: Jumped, Jousts

Each poster adds one answer to each category. The player who posts the 5th set of answers then selects a new letter ~ any letter he or she wishes, as long as it wasn't the last letter in play or a letter which has already been played with any of the current categories ~ and removes the top category and adds a new category at the bottom, leaving the other four the same. Then it all begins again.

One note: please try to make the categories you select "playable". It may be a struggle to find answers in many cases, which is a built-in factor of the game. However, coming up with "impossible" categories will be much more than a struggle and/or a challenge. That'll only stop the game dead in its tracks . And, of course, don't repeat answers.

Also, when you complete one letter and start a new one, please bold the new letter you've chosen. Thanks!