Here is the monologue, delivered by Bottom in the forest outside Athens:
I have had a most rare vision. I have had a dream past the wit of man to say what dream it was. Man is but an ass if he go about to expound this dream. Methought I was—there is no man can tell what. Methought I was, and methought I had—but man is but a patched fool if he will offer to say what methought I had. The eye of man hath not heard, the ear of man hath not seen, man's hand is not able to taste, his tongue to conceive, nor his heart to report, what my dream was. I will get Peter Quince to write a ballad of this dream. It shall be called "Bottom's Dream," because it hath no bottom; and I will sing it in the latter end of a play before the Duke. Peradventure, to make it the more gracious, I shall sing it at her death.
What is so funny about this monologue is Bottom's complete lack of self-awareness. He is convinced that he has had a profound and meaningful dream, but in reality, his dream was nothing more than a jumble of nonsense. His insistence that no one can understand his dream is also comical, as it is obvious that he himself does not understand it. Bottom's monologue is a classic example of Shakespeare's ability to create humor through characterization.