Explaining the basics of RDF to students today, I used the first phrases of Little Red Riding Hood to create a set of example triples based on a real world situation (well, almost real).

After two phrases, the board was already full of triples about mothers, grandmas, the little girl, her hood, baskets, etc.

It's a fun example, and everybody knew the problem domain quite well, which helps. Students even discovered inference by themselves, mentioning that two "is mother of" predicates on a path imply an "is grandma of" predicate.

By the way, if you haven't seen Tex Avery's version of the story, you absolutely have to - it's incredible.