The name 'Constable Guybrush' is a clear homage to the character Guybrush Threepwood from the Monkey Island games. April also whispers that Constable Guybrush "doesn't much like being called 'monkey' ", which refers to the Librarian from the Discworld novels. He was turned into an orang-utan and is usually quite affable, unless anyone is stupid enough to use the word 'monkey' in his presence. Obtained from the bottom of April's closet.