“When Elon and I would travel, and we had to fill out those forms at customs that wanted to know your occupation, Elon never wrote down ‘CEO,’ ‘King of the World,’ or ‘studly international playboy,'” relates Justine. “He wrote, ‘Engineer.'”
https://www.inc.com/justin-bariso/this-interview-question-from-elon-musk-is-absolute-genius.html