Nothing good, is the answer. In the third book, "Harry Potter and the Prisoner of Azkaban" (via Wizarding World), it's ...

In Harry Potter, Dementors first appear in The Prisoner of ... Rowling writes, “Get too near a Dementor and every good feeling, every happy memory will be sucked out of you.” ...

Rowling apparently based the "cold, unfeeling" Dementors on her personal experience ... Meghan DeMaria From our morning news briefing to a weekly Good News Newsletter, get the best of The Week ...

Dementors were first described in “Harry Potter ... hope and happiness out of the air around them … Get too near a Dementor and every good feeling, every happy memory will be sucked out ...

Throughout Harry Potter and the Prisoner of Azkaban, Harry is consistently pestered by the deathly cloaked guardians of the wizard prison: dementors. After his first few encounters with dementors ...

What we do know is that, in the Manichean world of J.K. Rowling, Patronuses are a good form of magic that serves partly as a foil to the bad magic of dementors. Patronuses are, in other words ...

Tumblr has figured out exactly why dementors affect Harry more than other people in the books — or at the very least, they have a pretty damn compelling theory. And we have a good excuse for it ...

Dolores Jane Umbridge is the most hated villain in the Harry Potter franchise, and with good reason ... she reveals that it was she who sent the dementors after Harry the previous summer.