A notable anecdote from Carmack's post:

"One time, my wife, then fiancée, and I were meeting with Steve at Apple, and he wanted me to do a keynote that happened to be scheduled on the same day as our wedding. With a big smile and full of charm, he suggested that we postpone it. We declined, but he kept pressing. Eventually my wife countered with a suggestion that if he really wanted “her” John so much, he should loan John Lassiter to her media company for a day of consulting. Steve went from full charm to ice cold really damn quick. I didn’t do that keynote."