Hello, Professor McGonagall,” said Moody calmly, bouncing the ferret still higher.“What — what are you doing?” said Professor McGonagall, her eyes following the bouncing ferret’s progress through the air.“Teaching,” said Moody.“Teach — Moody, is that a student?” shrieked Professor McGonagall, the books spilling out of her arms.“Yep,” said Moody.“Moody, we never use Transfiguration as a punishment!” said Professor McGonagall weakly.

Severus, please fetch me the strongest truth potion you posess, then go down to the kitchen and bring up the house elf called Winky. Minerva, kindly go down to Hagrids house where you will find a large black dog sitting in the pumpkin patch. Take the dog up to my office, tell him I will be with him shortly, then come back here.

There are those who'll turn innocent occasions to their advantage.

Authority figures always attract trouble