Willi Baumeister, Happy Day (1947)
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“So . . .” Professor Lupin had taken out his own wand, and indicated that Harry should do the same. “The spell I am going to try and teach you is highly advanced magic (...). It is called the Patronus Charm.” (...)
“What does a Patronus look like?” said Harry curiously.
“Each one is unique to the wizard who conjures it.”
“And how do you conjure it?”
“With an incantation, which will work only if you are concentrating, with all your might, on a single, very happy memory.”
(...) “The incantation is this —” Lupin cleared his throat. “Expecto patronum!”
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J. K. Rowling, Harry Potter and the Prisoner of Azkaban, 1999, pp. 237-238.
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