I'm quietly in favour of the short story challenge. But I'm favouring a 'starts with this sentence'. And then there being a choice of three or four. My personal favourite would be.

"Anita woke up in a puddle of semen."

Simply because there are so many ways one could take that - from gramatical error to who knows what sexual horrors.

Huh... wonder if that should be a 'bad fic challenge'