Imelda Staunton felt bad after Potter punishment

Actress Imelda Staunton has revealed that she found some of the cruel scenes her "Harry Potter" character Dolores Umbridge had left her feeling bad.
The 60-year-old actress starred as Ministry of Magic employee Professor Dolores Umbridge, who went on to hold a variety of positions at Hogwarts School of Witchcraft and Wizardry, including Defence Against the Dark Arts teacher and headmistress, in the film saga.
And Imelda said some of the scenes she had to film as her sinster character were very "difficult", particularly one in 'Harry Potter and the Order of the Phoenix' where Harry (Daniel Radcliffe) was forced to write lines - with the words then etching themselves painfully into the back of his hand, reported Entertainment Weekly.

"I want to make sure that I serve the purpose in the story
and it was very difficult. I loved doing it, but I have to say, the most difficult scene to do, which did leave me feeling pretty bad for a couple days, was actually the scene where I make him do the lines and it happens in his hand.
"You know, the 'I must not tell lies' detention scene. That touched into something that you think, 'Gosh, we're all capable of great cruelty.' It was a horrible, horrible feeling," she said.