I moderated a lame one for Bucky, IAP, and Steve the other day, and I'm willing to put a modicum of effort into coming up with less terrible prompts if people want to do this. Basically, you get a prompt and then you write as much as you can about it for a brief period of time, like 15 minutes to an hour. The point of doing these exercises is to condition yourself to write quickly without letting your filter get in the way, which is useful if you're a draft-oriented writer (which you probably should be unless you outline very exhaustively). Posting it afterwards is optional because it will be terrible, but you should post your wordcount if you participate.