John Gielgud as Hobson from Arthur - The 1981 version, not that shameful remake.
The other day Anna and I were talking about our favorite fictional characters from film, video games, books, etc. and Hobson was in my top five. Everything he says is hilarious.
The other four are Rowlf the Dog, Guybrush Threepwood, Ford Prefect, and Professor Farnsworth.