I love a medical school that gives online tests (quizzes, maybe?) and evaluates the results through JavaScript.  I especially love when it uses this logic to do it:

if(correct) return true;
else {
  if(guess < 2) {
    alert("That is not correct.");
    guess = guess + 1;
    return false;
  } else {
    alert("You have guessed incorrectly, but may move on.");
    return true;
  }
}

I hope my (hypothetical) surgeon works the same way.  “You’ve removed three organs.  None of them were right, but you can send him home now anyway.”