The Prime of Miss Jean Brodie
As Miss Brodie, she was young(ish), beautiful and in her prime playing a saucy teacher. You gotta love it.
A Room with a View
This is one of my top five movies, and Maggie Smith is so delightfully uptight in it as Charlotte Bartlett. (And it's really not easy to be delightfully uptight.)
Don't mess with Professor McGonagall. She is tough stuff.
The Best Exotic Marigold Hotel
Muriel Donnelly is a racist retiree who finds herself in India. Her character starts out terrible, but goes through a change that's great to watch.
She is perfect as the Dowager Countess. Acid tongued and pragmatic, she's so fun to watch.
Agree? Disagree? Have I left someone out?