Call him Sir Terry, or perhaps Sir Terry of Discworld?

http://news.bbc.co.uk/2/hi/uk_news/england/wiltshire/7804771.stm

http://www.news.com.au/story/0,27574,24858967-5018541,00.html

FANTASY author Terry Pratchett is now a real-life knight after being awarded the highest recognition in the Queen’s new year honours list.
Pratchett, 60, best known for his satirical Discworld fantasy series, becomes a knight, one of the queen’s most important honours, and will now be addressed as a ‘Sir’.
“There are times when phrases such as ‘totally astonished’ just don’t do the job,” he said. “I am of course delighted and honoured and needless to say, flabbergasted.”