I have been at Hogwarts for ten years in Azkaban
"No one knows Azkaban better than I do. I hope the Slytherins, Ravenclaws, and even the Gryffindor students will pay attention, and if you discredit me and send you to Azkaban in the future, I don't think the Dementors over there who know me will mind coming to you every day. After ten years in Azkaban, Browder, the new Hogwarts Muggle Research Professor, spoke to the new students.