|Unidentified whispering wizard in Knockturn Alley|
- "...He know what it's like..."
- —The wizard[src]
There are many things that could have made the Whispering Wizard act like he did. They could include:
- The Imperius Curse
- The Dementors Kiss
- The Cruciatus Curse
- Harry Potter and the Half-Blood Prince (film) (First appearance)