Former basketball star Shaquille O’Neal is now Carnival’s newly-named Chief Fun Officer. Yes, Shaquille O’Neal. Of course it makes sense for he embodies the kind of people Carnival wants on its ships: social, happy and a tad goofy around the edges.

Science suggests that there are unusual things happening in the brains of power-holders. Decades of study have shown that the psychology and physiology of powerful people are notably different from those of average people – down to the architecture of the brain’s prefrontal cortex, and the way the heart pumps blood.