Name Your Tale. Submit a title, and and one of the authors of Name Your Tale will write a 100-word short story based on the submitted title. For example, "Andrew Received Cancer."[via mefi projects]
You should read these three stories by Amy Hempel. (Oh, and maybe listen to her read, here.) While you're at it, read some of these idiosyncratic but beautifully-written stories by grammarian Gary Lutz.