The document is a screenplay for a film titled "A Dangerous Mind". It describes scenes of a visitor arriving at a college campus and entering a professor's classroom building. The professor senses he is no longer alone and feels uneasy. The visitor approaches the professor from behind and the professor lets out a scream before falling to the ground. The visitor leaves in a hurried manner. The three key events summarized are: 1) A visitor arrives at a college campus and enters a classroom building. 2) A professor inside senses another presence and feels uneasy. 3) The visitor approaches the professor from behind and the professor screams and falls to the ground.