David Attenborough voice: Here is a rare treat! We are now witnessing an encounter between narcissistic billionaires. Make no mistake, this is no courtship however; notice the pointedly cordial tone. This is a veiled insult. They see themselves, and even they feel compelled to strike.

We can distinguish an animal's self awareness by how they respond to a mirror. Do they recognise themselves, or do they perceive a threat? Billionaire specimens are usually out of budget for science departments, so we must trust in careful observation to deduct their nature.