On pourrait faire tout un programme comme ça :

"Press any key."
-a
"Not this one."
-z
"Not this one either."
-e
"Try again."
-r
"You really suck at this."
-t
"BZZZZT ! Wrong again."
-µ
"Are you retarded or something ?"
-@
"Haha. No."
-ENTER
"That's not a real key."
-a
"You already tried this one, genius."
-§
"Congratulations, you found it ! Hah, just kidding. You suck, try again."
-mljrshiomzuimze"'y+64hsrqjk'
"Randomly punching your keyboard is not a key."
-[barre d'espace]
"THERE ! WAS THAT SO FUCKING HARD ?"

Et après le programme plante.