A red hatter could be :

• A member of the Red Hat Society
• A proponent of the Red Hat distribution of the Linux Operating System
• Someone who wears a red hat

• The Godfather: The Don's Edition
• The Godfather Theme
• The Godfather: The Videogame
• The Godfather trilogy
• The God Gambit
• The Godiva Affair
• The Godless Girl
• The God Machine (comedic prop)
• The God Machine (novel)
• The God Makers
• The Godmakers
• The Godmakers (film)
• The Godmakers II
• The God Makers II
• The God Makers II (Film)
• The God Monologue
• The Godmother
• The Godmother (book)
• The Godmother (Weeds episode)
• The Gododdin
• The God of all Daleks
• The god of destruction
• The god of small things
• The God of Small Things (novel)
• The god of thunder