Or you could be a serial killer who specializes in reading books, then seeking out the authors and murdering them in horrible ways. {If you happen to fall into that last category, you should know that my name isn't really Alcatraz Smedry, nor is it Brandon Sanderson. My name is in fact Garth Nix, and you can find me in Australia. Oh, and I insulted your mother once. What're you going to do about it, huh?}
Someone could have a dark obsession with books and authors, going as far as murdering the writers in gruesome ways. This exaggerated idea highlights a twisted fascination or perhaps a bizarre fantasy involving literature and violence.
The quote reveals that the speaker is actually Garth Nix from Australia, not Brandon Sanderson, and humorously mentions having insulted the reader's mother, challenging them in a playful, confrontational tone.