J.K. Rowling isn't afraid to play a little dirty, getting fans to tweet support for her Scottish rugby team in exchange for some "Harry Potter" intel. Love your style, Jo, don't ever change!

She was at St. James Park for the Rugby World Cup and told her followers, if they shared support for her Scottish team, she'd reward them by revealing the birthday of Harry's godfather, Sirius Black (Gary Oldman).

Fans responded in force, with one rationalizing that, since Hogwarts is meant to be in Scotland, it makes sense for Harry Potter fans to share support for the Scottish team. Since fans did their part, and her team did its part, Rowling shared Sirius' birthday:

November 3! It's almost his birthday. Then again, he's dead so ... it's a Deathday Party! Except the Harry Potter Wikia says he died on June 18, 1996 at age 36, so that would've been the Deathday anniversary. He was born in 1959, so he would've been 56 next month. We'll have to tip our hats to his mischief managed in just a few weeks.

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