Thanks to Wired magazine and to Ken McLeod I can now say that I've actually read some Hemingway. For what its worth, my favourite six word short story is the one from Margaret Atwood. Damn, I can also now say that I've read some Atwood as well.
PS - I thought I would chip in with my own contribution. The title above is for the follow up to Barltrop's 'The Monument: the story of the Socialist Party of Great Britain'.