In Shakespeare's A Midsummer Night's Dream, the story of Pyramus and Thisbe becomes a comical interlude because it is presented as a play-within-the-play, performed by the amateur actors known as the Mechanicals. The Mechanicals are not professional actors, and their lack of skill and knowledge of the craft leads to a number of comedic mishaps.
For example, the play is meant to be a tragedy, but the Mechanicals' clumsy acting and poor production values turn it into a farce. The actors mispronounce words, mix up lines, and use props inappropriately, such as a lantern to represent the moon.
Additionally, the play's plot is exaggerated and melodramatic, with Pyramus and Thisbe engaging in over-the-top displays of love and devotion. The characters' overly serious and romantic language also adds to the humor, as it contrasts with the amateurish delivery of the lines.
The play's ending is also comedic, as the tragic deaths of Pyramus and Thisbe are depicted in a hilariously clumsy and inept way. For example, the actor playing Pyramus stabs himself with a wooden sword, but it is so poorly made that it fails to pierce his skin, leading to exaggerated and comical death throes.
Overall, Pyramus and Thisbe become a comical interlude in A Midsummer Night's Dream because their story is presented as a parody of a tragic romance, performed by inept actors whose mistakes and exaggerated acting add to the humor of the scene.