The thing which caught the interest of one of my interviewers was a side project I had creating tools to be more effective at playing Travian.
Travian did something interesting, in that each server instance would dump a single database table nightly for players to ingest and tinker with.
I wrote a script which would grab the file, de-MySQL it to get it to run on SQLEXPRESS, and then execute some stored procedures to extract some insights out of the data. Then, I had some Asp.Net pages which would let you do interesting stuff with it: Find inactive accounts, Track someone's alliance history, a few other things. I had half a dozen tools for different things, mostly I focused on building stuff which nobody had thought of yet, and made the tools only available to people in my alliance.
All this was on the roadmap to start building a bot to play the game for me. That turned out to be a lot more work, and I ended up losing interest in the game in the interim.
We only spent about 10 minutes or so talking about it, but still, it was 10 minutes of followup questions. I feel pretty strongly this, and one other anecdote is what got me hired. (The other anecdote was writing a really dumb hotfix out of a decompiled java class to fix Novell eDirectory support for one of my prior company's products - in protest of our engineering group not finding the effort worthwhile)