If you've never read Hamlet, you've probably seen some iteration of the story. Prince Hamlet is visited by the ghost of his father, and is told to avenge his death. In order to do so, he arranges a play for his dear old Uncle Claudius, who murdered his brother the king. It's tragic, suspenseful, and has such memorable lines as, "To be, or not to be: That is the question."
How it will change you: Aside from OFFICIALLY knowing where all of those famous Shakespeare lines come from, the issues of mortality and consequences after death are definitely something you'll think deeply about.