Last night, Harry Potter fans around the world celebrated the Boy Who Lived with Harry Potter Book Night, an event designed to invite new and old readers alike to explore J.K. Rowling's Wizarding World together.

As first-time and longtime "Potter" readers shared their experiences online with the hash-tag #HarryPotterBookNight, Rowling herself came out of the woodwork to share how touched she was by the event — so much so that she even reached out to some unassuming "Potter" fans and answered three mysteries:

When "Potter" fan Charles Estrada wondered aloud about why Sirius Black's house, featured in "Order of the Phoenix," exists in the midst of a Muggle community, Rowling chimed in with an unprompted answer:

What can you say? Muggles aside, the Black family has great taste.

How about the mystery of Hagrid's three-headed dog Fluffy? That question has been on fan Emily Strong's mind since at least January 27, when she asked it to no one in particular on Twitter. Yesterday, she posed the question to Rowling, and earned the response she was looking for:

Here's hoping Fluffy's enjoying some grape leaves and a nice tan right about now.

Finally, when Tumblr user gardenburger asked why the Horcrux within Harry Potter wasn't destroyed when he was bitten by the basilisk in "Chamber of Secrets," a fellow user advised him to get Rowling on the phone. It turns out, no phone call was necessary. Rowling was already on the case, as she replied:

There you have it. Three mysteries solved. Now that Rowling has opened Pandora's box, there's no better time to send your own burning questions her way.