To add to Klingsor's solution, you can answer 9 questions wrong in Episode 1 (the DisOrDat doesn't count), and then quit as soon as you answer the 9th one wrong (which would be question 10). Although it may not say it is saving your progress, it actually is. Start up episode 1 again and answer the first question wrong and it should pop. This solution is intended for people that don't want to mess up their stats for the Unicorn achievement or for any other reason.
Update: Just to be on the safe side, you may want to start up Episode 2 after answering 9 wrong in Episode 1, as one user stated that repeating the episode did not work for him. It did for me, however.