My mate was underwhelmed, asking if I'd seen it. I hadn't and asked him to show me. He asked me what I expected to see. To his surprise, I described what the image showed... a circular halo with a bright side. He asked why the bright side? I told him Doppler. We're looking at very fucking hot matter, probably plasma, orbiting at a significant fraction of light speed, slowly being consumed by the black hole. Half of what we see is moving away from us, half towards us. The bright side is moving towards us. I also told him the hole we see is 2.6 times the radial size of the actual event horizon, and told him to dig more. Now he isn't underwhelmed, he finds it interesting.

I saw a youtube guy predict what it would look like, based on what GR would predict. So I knew what to expect.

Mind still blown.