Headmaster Greystash is a deceased headmaster in the Angelica Button series by T. R. Francis.
Greystash's defining feature is his impressive mustache, several feet long on each end and endowed with special powers. When Homer skipped to the end of the final book and discovered Greystash was killed by an evil wizard, he invents a happier ending for Lisa. In this new ending, Greystash downs a can of spinach, granting his mustache powerful muscles. The evil wizard is clobbered to death, and Greystash saves the day.
 Behind the Laughter
- Greystash is a parody of Albus Dumbledore in the Harry Potter book series.