What hast thou done? Thou hast mistaken quite
And laid the love juice on some true-love’s sight.
Of thy misprision must perforce ensue
Some true-love turned, and not a false turned true.
– William Shakespeare
A Midsummer Night’s Dream, Act 3, Scene 2. Oberon realizes that Puck has caused the confusion in love by putting the "Love-in-Idleness" flower juice on Lysander instead of Demetrius. He scolds Puck for enchanting someone truly in love. Because of his mistake, someone’s true love has been turned false, and not someone’s false love turned into true love.