I started this as a bit of casual fun, so rules are lax:
1) Keep it under 500 words, post your piece in the comments, or a link to your blog
2) Use the sentence as-is, or as an inspirational point to leap from, so feel free to change tense/grammar/etc.
3) Don't stress too hard. This is supposed to be fun & quick. It can be a story, a poem, or even a character sketch. Try something new, maybe something you're nervous to try in a full length story. Seriously, spend 20 minutes and see what you get :)
Fair warning: the lines are random things that pop into my brain, so no guarantees that they're spectacular ;)