Today's challenge: Write down an idea, for later work.

It can be any idea, anything that you've thought about possibly writing. It might be an idea for a single scene, or a single piece of dialogue, or it could be an idea for a full story. It might be notes on the basic idea and possible ways you might change it.

The point is to get it down on paper or on your computer, with enough detail that you won't come back to it in a month and wonder what in the world you were talking about.

And remember, this is writing down the idea, not actually writing the scene/story itself. That's for later.