We have this guy who is responsible for software testing, user support and stuff. Not a programmer but with good technical base knowledge. He was interested in writing automated tests, and I told him he might take some time to learn and help us there. In the last months I had to answer and explain a gazillion questions about our codebase and coding in general and it took me lot of time. But last week he showed me his first test suite which was actually good code and showed a lot of understanding of all aspects of this. This was more satisfying than anything on work ever.