A hypothetical situation where 20 CEO's board an airplane and are told that the flight that they are about to take is the first-ever to feature Pilot less technology: It is an un-crewed aircraft.
Each one of the CEO's is then told, privately, that their company's software is Aircraft's automatic pilot system. Nineteen of the CEO's promptly leave the aircraft, each offering a different type of excuse.
One CEO alone remains on board the jet, seeming very calm indeed, asked why he is so confident in this first un-crewed flight, he replies "If it is the same software that runs my company's IT systems, this plane won't even take off."
This is Confidence!