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Stand-up is one great way to think about screenwriting. It’s an idea that’s written down in a specific format that requires the audience’s emotional participation. You know, storytelling.
Comedians make a point in a specific, personal way, with jokes. If they weren’t jokes, this would be a lecture. Or a speech.
Donald Glover has good ideas. He could write songs about them, or poems, or blog or teach, but his preferred medium is jokes.
For a screenwriter, the medium is images.