Despite the fact that sarcasm is often held to be the lowest form of wit, a mockumentary can be a great way to introduce students to a topic. This beautifully crafted video gives plastic bags the full nature documentary treatment, and in doing so provides a humorous way for students to approach a very serious topic. For environmental leaders, this can provide a great jumping-off point for school-based action. From a Media Studies perspective, it also provides a way for students to think critically about the distinction between content and presentation. This can lead to discussions on the production of persuasive, emotive content that is not necessarily grounded in truth (such as propaganda).
Great collection of free documentaries on a wide range of topics. This site represents a goldmine of material for encouraging students to question the status quo, and look at the world outside of their own experience.