Prompt: A man comes home to find a girl there. The girl's not supposed to be there. By the end of the story, one of them will leave. They'll never see each other again.

There's your scenario. Here are your stipulations!

First, no other characters can exist in this story - not presently, retrospectively, speculatively, or in somebody's imagination. As far as your narrative is concerned, the world consists of these two people, in this place, at this time. Dance around this rule as much as you feel like risking, but if I see any other specific characters mentioned, even something vague like an uncle/aunt who reminds somebody of [x], I'll drop you down the memory hole.

Second, and most importantly, these two people must be complete strangers to one another. That means no shared relations, friends, or God help us, long-lost et cetera. No passing glances on the street or muttered rumors pertinent to either of them prior to this date. What's more, neither of the characters can even suggest they know each other. They have nothing tying them together in any way.

Everything else is up to you. Be as ambitious as you like with the details.

A lot of the Thunderdome entries up to this point have been strongly concept-based, so this is the other side of the coin. What I want to see here is how you establish, develop, and terminate a connection between these two people in 1000 words or less. Light a candle in the dark, and then blow it out.

Everything else comes down to the strength of your prose and whether whatever narrative skullduggery you pull/don't pull impresses me or not. Did I mention the word limit is 1000 words or less?