If I'm ever in the position to interview, I'd ask the candidate to teach me something of their choice. (Preferably something in the realm of technology rather t

If I'm ever in the position to interview, I'd ask the candidate to teach me something of their choice. (Preferably something in the realm of technology rather than how Magic: The Gathering works, but I'd accept either.) Teaching me things I don't know is better since I'd rather have someone who has a different knowledge base, though teaching me things I do know might help me judge their ability to explain things. (e.g. making reference to an efficient subway system (New York's) when explaining skip lists as done in the MIT video: http://www.youtube.com/watch?v=kBwUoWpeH_Q http://www.youtube.com/watch?v=kBwUoWpeH_Q ) A lot of my interaction between coders is explaining to each other what we've done, I'd prefer someone who might be a worse coder than me but can explain things well (and write good commit messages, etc.) than a guy who writes epic code but can't explain it to me.