A Midsummer Night's Dream — Act 3, Scene 2: Another part of the wood.

Oberon meets Puck in the wood and learns that Titania is now in love with Bottom, the man Puck has changed into an ass. He also discovers that Puck has accidentally enchanted Lysander instead of Demetrius. Oberon sends Puck to bring Helena, then watches as Lysander and Demetrius are both drawn into a quarrel over Helena. Hermia arrives looking for Lysander, but the confusion only grows, and Helena believes the others are mocking her. After the four lovers separate and lie down to sleep, Puck puts the love-juice on Lysander’s eyes so he will wake loving the right woman.