is a 2006 children's book written and illustrated by American author Chris Van Allsburg.

The trick is achieved with a rotating spiral disc, and the spell is broken by saying "Probuditi!".

Calvin and Rodney are successful and Trudy soon believes she is a dog.

They frantically try different methods to turn Trudy back to normal, and dumping water on her finally does the trick.

However, in the end, Trudy reveals that she was only faking her hypnotized state.