|Pig into desk|
Turns pigs into desks
- "Then she changed her desk into a pig and back again. They were all very impressed and couldn't wait to get started, but soon realised they weren't going to be changing the furniture into animals for a long time."
There existed a transfiguration spell that could transform a pig into a writing desk. Professor Minerva McGonagall demonstrated it for her first-year Transfiguration class, but they were disappointed to learn that they had much practise and learning to do before they would be able to perform the spell themselves. This demonstration had been to revert [Desk into pig|a previous demonstration]] in which she'd transformed her desk into a pig.