General Rule: You do not use a comma before a movie title unless it is part of a longer, more complex phrase.
Example:
* I watched "The Matrix" last night. (No comma)
Exceptions:
* When the movie title is part of a longer phrase: You might need a comma if the title is being described or introduced in a longer sentence.
* Example: "The Matrix," a science fiction film, is one of my favorite movies.
* When the movie title is used as an appositive: An appositive is a phrase that renames or identifies something else in the sentence. In this case, you'd use a comma before and after the title.
* Example: My favorite movie, "The Matrix," has a mind-bending plot.
Key Takeaway: If you're unsure whether to use a comma, try reading the sentence out loud. If you naturally pause before the movie title, a comma might be appropriate. Otherwise, you'll likely be fine without one.