He did a Reddit AMA (ask me anything) a couple of days ago. He was asked this about the attempt to land the booster on a floating platform:
Previously, you’ve stated that you estimate a 50% probability of success with the attempted landing on the automated spaceport drone ship tomorrow. Can you discuss the factors that were considered to make that estimation?
I pretty much made that up. I have no idea 🙂
And in a discussion of the possible dangers of artificial intelligence, he posted a link to this video: