In 2006, Wired Magazine had a great project asking horror, fantasy and science fiction authors to submit six word stories in the tradition of Hemmingway's famous 'very short story,' which Hemmingway considered his best work.
Diversicon's 2010 posthumous guest of honor, Sir Arthur C. Clarke submitted:
"God said, 'Cancel Program GENESIS.' The universe ceased to exist."
True to form, he refused to trim it. But it's not a bad story. ;) You should take a look at the others submitted by Neil Gaiman, Stephen King, William Shatner, Margaret Atwood, Neal Stephenson and Ursula K. Le Guin, and many others. Steven Meretzky apparently had a real field day with it.
Hmm. If I wasn't in the middle of NaNoWriMo I'd totally be doing this this weekend. :)