Write a program that asks the user
Do you want to use this program? (y/n)
If the user says ‘y' then the program terminates
If the user says ‘n' then the program asks
Are you really sure you do not want to use this program? (y/n)
If the user says ‘n' it terminates, otherwise it prints again the message
Are you really really sure you do not want to use this program? (y/n)
And so on, every time adding one more "really".