Narcissa and Lucius Malfoy both had white-blond hair, while Molly and Arthur Weasley both had red hair.
Dumbledore, Voldemort, and Harry each came to possess a Hallow through either force, inheritance, or in Voldemort's case, a combination of both. This is strange, because they are three of the five most well-known main characters of the entire series, and pretty much the most famous names in British Wizarding history.
Whenever a Gryffindor needed to kill a snake, the Sorting Hat was ready with a sword. Talk about far-fetched magic!
Strangely enough, Neville's and Harry's shared birthday cannot be considered much of a coincidence, because the probably that two people have the same date of birth in a classroom of twenty students is 41.1%.
When Harry and Voldemort fight for the final time, Harry is 17, and Voldemort is 71.

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25 Flaws in Harry Potter
RandomA collection of [ehem] glaring flaws - plot holes, inconsistencies, and counter-intuitive occurrences not explainable by even magic - in the otherwise splendid Harry Potter books by J. K. Rowling. Co-authored by Jadefireeyes and Frozenpaw. Please co...