In 'A Midsummer Night's Dream', the weaver turned into a donkey is Nick Bottom. Bottom is one of the group of working men, or “mechanicals,” who rehearse a play about Pyramus and Thisbe for the wedding of Theseus and Hippolyta.
During the rehearsal in the forest, the fairy Puck encounters Bottom and magically transforms his head into that of a donkey. The other actors flee in terror, but Bottom does not realise what has happened. His confidence and comic obliviousness make the scene one of Shakespeare's most memorable episodes.
Titania, queen of the fairies, has been enchanted by a love potion and wakes to find Bottom. Under the spell, she falls in love with him and orders her fairies to attend him. Oberon later releases Titania from the enchantment, and Puck removes the donkey's head from Bottom.
Bottom is a weaver by trade, but he also plays Pyramus in the amateur performance. His name is often confused with the names of the other mechanicals: Peter Quince directs the troupe, Francis Flute plays Thisbe, and Snug plays the lion. Only Bottom receives the donkey transformation.