One example of a humorous moment in "A Midsummer Night's Dream" is when Bottom, a weaver, gets transformed into a donkey and the fairy queen, Titania, falls in love with him. This leads to several comical scenes where Bottom, now with a donkey's head, tries to converse with his fellow actors who are horrified by his transformation.
Shakespeare structured the play to create this humorous moment by incorporating the magical elements of the play, such as the intervention of the mischievous fairy Puck, who uses a love potion on Titania, causing her to fall in love with Bottom. The situation is absurd and unexpected, which adds to its comedic effect. Additionally, the use of mistaken identity, exaggerated language, and physical comedy, such as Bottom's exaggerated braying and awkward movements, all contribute to the overall humor of the scene.