Such a strange question, since my answer is “All of them”–meaning not that I’ve seen every Robin Williams movie ever made, but that I haven’t seen any movie of his on TV that I haven’t in a theater. I guess the theatrical experience is considered a rarefied one these days, whereas the number of films I’ve seen on the big screen but not the small far outnumber the reverse.
So my 5 favorite of his (in alpha order): AI: Artificial Intelligence, Aladdin, Insomnia, Moscow on the Hudson, The World According to Garp.
The only movie of Robin’s that I saw in the theater was The World According to Garp.
Now, I’ve seen a ton of movies (a ridiculous amount - Netflix says I’ve rated mhmm-mmbl-mhmmhmm). But I’ve never been big on going to the theater to see them - I was the kind of guy who preferred to see movies at home, a full decade before that was even possible, and about two decades before that was even likely.
Anyway…
At the time, I was in High School. I was only aware of Mr. Williams’ work in Mork and Mindy - that, and my most favoritest episode ever of Happy Days (I think that episode formed a significant part of my personality - I have always looked for the crazy, weird thing that nobody believes and looks like lunacy, but nevertheless turns out to be true. OMG, what a frustrating existence, but oh, SO rewarding!).
Anyway…
Garp was probably the first adult-oriented movie I ever grokked. It was so weird, and different, and so fucking interesting. I was fully entranced by the characters and the development of Garp, in a way that took my adolescent self into the world of adulthood. This was my coming-of-age movie. Not because it was about that topic, but because this was the movie that impelled me to come-of-age.
I can’t believe I’ve only seen it the one time, and yet, I remember it better than most movies I’ve seen a half-dozen times or more.
I saw Rain Man and it was really good. I especially loved the music.
I thought they could have done a much better job with the females in that move. The females they cast were just not very interesting IMO.
But, I’d like to add that I just saw World’s Greatest Dad (although not in a theatre) and I have a feeling that will go down as being one of his most enjoyable films ever.