Ask HN: What's the best way to teach my kid to code?

Hey folks. Apologies if this question has been asked before (if it has, please point me to the answers). I want to get my 5 year old son into coding. He's pretty handy with basic tasks on the computer, and more importantly is inquisitive and creative.

He also has the attention span of a 5 year old, so if he wants to learn anything, it not only needs to asume no prior knowledge of programming, but also needs to quickly and repeatably deliver some escalating level of gratification in order to keep a kid (or for that matter, most adults) interested.

What resources are around geared towards kids learning to code that don't assume too much knowledge, are hands on and interactive, and are actually fun for a 5 year old? If you're a parent who's taught their kids to code, what resources and/or techniques worked for you? What didn't?

(A future programming prodigy is grateful in advance for the benefit of your insight.)