Stop the Nonsense
Maggie Smith had a long professional history prior to joining the Harry Potter set. But when she did, young people all throughout the world became aware of her as the rigorous but devoted Professor McGonagall.
Maggie Smith was just not able to handle some foolishness, even though it must have been a good sensation to have a whole new set of people notice you. No, she wasn’t a cat at all. Get your act together.