All you need for this introduction to freedom of speech is a student willing to shout an expletive in the middle of class...twice. Easy? Meet with the pupil (choose wisely!) before class, explaining they are to swear loudly at a time you choose. After being reprimanded, he must repeat the word, prompting you to take him/her out of the room, leaving the rest of the confused class digesting the incident. Re-enter the room and begin a discussion on freedom of speech.