How would you teach a middle / high schooler how to code?

Obviously there are many sites out there on "teach yourself how to code" and books on "learn to code in 30 days." I have a little bit of a different take on the subject, and would love to get your opinion.

If you were teaching a 14 year old the most important thing to expose them to the world of programming, what would it be? Let's say you have 1-2 hours a week and a year to do it.