All the Mind-Blowing Plot Coincidences in Harry Potter
The Wildest Harry Potter Plot Coincidences You Might Not Have Noticed
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In Prisoner of Azkaban Professor Trelawny refuses to sit at a table with 12 other characters because she would be the 13th and the first one to get up after that would die. In Order of the Phoenix, 13 members of the order are sitting and Sirius is the first to stand.
— Quora user Joseph Chastain