Dumbledore only looked taken aback for a moment, then he sat down smartly and looked alertly at Professor Umbridge as though he desired nothing better than to listen to her talk. Other members of staff were not as adept at hiding their surprise. Professor Sprout's eyebrows had disappeared into her flyaway hair and Professor McGonagall's mouth was as thin as Hermione had ever seen it. No new teacher had ever interrupted Dumbledore before. Many of the students were smirking; this woman obviously did not know how things were done at Hogwarts.