If I think about it I love so many of his performances, for me though one it's got to be Bicentennial Man. The film never really hit it off with critics, but I loved Williams in it and thought he did enough to make the film memorable and good, in my eyes at least.
Of course his performance in Good Will Hunting is as good as it gets as well, and Hook and Mrs Doubtfire were childhood favourites and Path Adams, again on the strength of his performance alone, is another personal favourite of mine.








