Back when I was about fifteen, I wrote up a manuscript for "Oriental Dinky Dungeons" and sent it off to Doc's Games.  Eventually, I got back a letter (handwritten on notebook paper, no less!) saying that they'd like to publish it.  I never heard back from them again, sadly, and obviously the publication never took place.  However, I turned up the letter not too long ago.

I'm glad I still have it; while nothing ever came of it, it was my first acceptance letter, and so it has quite a bit of sentimental value.