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The following information is based on events in Interview for a Wizard and contain spoilers.
This magic chant is used to command a crystal ball to disclose the identity of its current owner. The spell was used by the three witches of This and That in Mount Dora, Agatha, Clara Towers and Isabella on Lord Bane's crystal ball to discover who owned it.
The chant was as follows:
- Bubble, bubble toil and trouble,
- We need to know on the double,
- Tell us the name,
- Tell us the history,
- Show to us the owner of this mystery
- The lines of the chant "Bubble, bubble toil and trouble" / "We need to know on the double" is a reference to William Shakespeare's play Macbeth, in which a group of witches stir a cauldron and chants "Double double, toil and trouble" followed by other rhymes. This chant has been associated with witchcraft in popular culture ever since the original play was staged in the early 1600s, or possibly during the 1700s or 1800s as Shakespeare became more known across the world.