How to Drive McGonagall Insane in One Class Period

Step 1: When she starts threatening you with detention, pull out a piece of catnip.

Step 2: Ask her if her hair bun is actually a hairball she coughed up.

Step 3: Tell her that she looks like a 500-year-old grandmother

Step 4: In the middle of her lecture, stand up and say 'I object!"

Step 5: Give her a dog for [Insert/Make up holiday here]

Step 6: Yell to everyone that McGonagall flunked her Transfiguration O.W.L.s

When you get detention for the rest of your Hogwarts career, you have completed your mission