This is a great challenge. 75 words (including the title) - it can be a piece of flash fiction, the opening of a novel or whatever you like, as long as it stands up as a story.
To my mind, with such a limited word count, I reckon the thing to aim for is to suggest that there's a bigger story going on beyond that one paragraph, without looking like you've tried to cram one in. But that's just my interpretation.
Check out Paragraph Planet. They've published my story Seventy-Six today.
I've been writing for as long as I can remember (I think my first letter was a P). I got a degree writing about other people's writing and ever since then I've earned a living writing commercially, one way or another. But I never stopped writing and refining my own stuff. I just didn't do anything with it, until now.