This idea was first suggested by Tom Woodward and has been a long standing popular ds106 assignment.
The assignment is to reduce a movie, story, or event into its basic elements, then take those visuals and reduce them further to simple icons, four of them. Write your blog post up but do not give away the answer, let people guess! The challenge is to find the icons that suggest the story, but do not make it so easy. For icons a great resource is The Noun Project.