The juice of it on sleeping eyelids laid
Will make or man or woman madly dote
Upon the next live creature that it sees.
– William Shakespeare
A Midsummer Night’s Dream, Act 2, Scene 1. Oberon instructs Puck to fetch him the "Love-in-Idleness" flower. He explains that when the magic juice from it is put into someone’s eyes, it causes that person to fall immediately in love with the first creature they see.