Wizardology is a real book about wizards, a copy of which was extensively vandalized by Andrew Hussie (and subsequently sent to his friend Tynic as a gift).

An archive of the images Hussie posted of his alterations can be found here. The image with which Hussie concluded is the source of the "You're welcome" ongoing gag in Homestuck. The tradition of humorously vandalizing books was continued in Homestuck by Dirk Strider, who sent Jane a personalized copy of Pony Pals: Detective Pony for her birthday, and by Caliborn when taking control of the website.

Other, more classic humourously defaces by Hussie are Lowell Thomas's The First World Flight and a Russian version of Harry Potter and the Order of the Phoenix.

Works by Andrew Hussie
MS Paint Adventures JailbreakBard QuestProblem Sleuth (Midnight Crew)HomestuckRyanquest
Team Special Olympics BlurbScriblettesWhistlesAnd It Don't StopNeon Ice Cream Headache
Videogames Namco HighHiveswapHiveswap Friendship SimulatorPesterquestPsycholonials
Other Barty AndersonJandrew EditsWizardologyParadox SpaceThe Homestuck EpiloguesHomestuck^2: Beyond Canon
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