... which, incidentally, is the DOM event you can guarantee will be fired, regardless of the input device (unless you choose to `preventDefault()` before it gets a chance).
How cheap and easy it is to get into web programming. Everything they need (except a computer and an internet connection) is free. And the fact that there'll be plenty of jobs in software/web for the foreseeable future. And that it's fun and they can pwn their mates.
Maybe throw in a focus on mobile development too - I'm always amazed at how many low-income kids around here have smartphones.