Super-short, not exactly original, but well-done and strangely foundational: The Egg is a wonderful little, tiny, short story. I first read it some years back, but it always stayed with me, just in the back of my head. Now I came across it again, and I thought I should share the goodness with you.
Note: As per, the story is not actually by Andy Weir (and, indeed, it reads extremely out of character).