This was years back when I was a business systems analyst. I wrote the specs for an instant messaging system that was supposed to work inside a particular game as well as on the website that hosted several different games.
The dev told me my requirements and specifications documents were so we'll done that he wished I wrote the specs for all of his projects.
I like this question, we never remember the compliments and I have to admit I struggled also! The most memorable was that I set a new benchmark in progression and leaves big shoes to fill :) definitely validated all the hard work I put in :)