There's an oblique hint in the source code, sometimes.
Though with that one, the first line of the hint helped me, but the second just confused me (I've just looked up the full story behind the "Run run" reference -- I suppose it was a reminder of the ending to the story? Lost on anyone who doesn't remember the full thing, though...).
Having never heard that tale, I was stumped. I supposed it is part of US culture? I'm from Sweden myself, so if I was told the story as a child, it wouldn't have been in english anyway.
