Sad news indeed. So many good memories are tied to this man. :-(
My family actually watched Jumanji together two days ago. It was my kids' first exposure to Robin Williams as an actor (they've seen Aladdin), and it hit the sweet spot of making them laugh, holding them fascinated, and also scaring the crap out of them a couple of times.
Mrs Doubtfire was a childhood favorite for me, both because it is hilarious and because it helped me express emotion about my own parents' divorce. Similarly, as a teenager Dead Poet's Society inspired me in a very deep way to make the most of life despite struggling with anxiety and depression, and to find beauty in simple things.
Rest in peace.