I actually found the ramp-up from security guard to sceptic pretty clever. Demonstrate the principle on an easy, constructed case; verify on a real-world exampl

I actually found the ramp-up from security guard to sceptic pretty clever. Demonstrate the principle on an easy, constructed case; verify on a real-world example; then present the applications you care about and have somewhat more controversial content. Although I agree that the number of repetitions is higher than optimal here.