Speak for yourself, Darth Vader!
While I'm on here, may I add that the "One mistake's OK but I won't let you do it twice" thing is not something that should be seized upon by knockers - it's not something I'd say (because it sounds wanky), but when taken in context (eg, motivational address to new course to exhort them to work hard and not let themselves slacken off), it ain't that bad - a bit like a footy coach saying "Get out there and rip their f***in' heads off!", not necessarily meant to be taken literally...
As we all hopefully know by now, all reasonable steps are taken to help people pass, but unfortunately there's no infallible way of predicting how they'll do until they're on course.