The red carpet is kind of a surreal experience. There's nothing normal about it, so for me the most important thing is to maintain some normality right until the point you get out of the car.
I defied the machinery to make me its slave. Its incessant discords could not drown the music of my thoughts if I would let them fly high enough.
But things such as 'Harry Potter', all I can do is shape my character, seek the director's approval on that, and basically take it from there. Professor Flitwick in 'Harry Potter', I kind of defined how I saw him from reading the book, and luckily that matched up with the director's vision.