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This one is better than yesterdays in my opinion

JK Rowling uses the number 7 often throughout the series. There are 7 grades at Hogwarts, 7 books, 7 years old is the general age when wizards and witches begin to show magical qualities, the chapter "7 Potters" in the Deathly Hallows, Voldemort makes 7 Horcruxes, 7 players on a quidditch team, 7 Weasley Children, 7 floors to Hogwarts, Harry paid 7 galleons for his wand, 7 puzzles leading up to sorcerers stone, the basilisk attacked 7 people, 7 snakes on the door to the Chamber of Secrets, and Harry escaped death 7 times from Voldemort. There are actually plenty more than the above mentioned, and if you want to read them, you can click here

Your mind is definately blown

(for funsicles, 7 is a multiple of 42, which just so happens to be the name of my blog)