I heard this back around 2000, when I used to be an IT type. Others probably won't laugh much.
Twenty IT executives board an aircraft 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 running the aircraft's automatic pilot system. Nineteen of the CEO's promptly leave the aircraft, each offering a different type of excuse.
One lone CEO remains on board the aircraft, seeming very calm indeed.
Asked why he is so confident in this first un-crewed flight, he replies: "If it's the same software that runs my company's IT systems, this plane won't even take off."