Williams plays a man who loses custody of his children following a divorce with his wife. Down on his luck, he figures the only way to see his kids on a regular basis is to disguise himself as an elderly British woman and become the kids' nanny. Premise aside, the movie is hilarious.
Probably the least-celebrated of Christopher Nolan's film, Insomnia sees Williams in a serious role, playing a crime writer who gets involved with a dirty cop.
The perfect vehicle for Williams' irreverent brand of humor (other than #2), he plays a DJ sent over to Vietnam to bring some humor to the Armed Forces Radio. Wildly popular with the grunts, he begins to get on the bad side of the higher-ups.
One of his most controversial roles, you either loved or hated him as Seymour Parrish, a photo technician who gets too infatuated with one particular family.
The film for which he run his only Academy Award (Best Supporting Actor), Good Will Hunting follows Matt Damon's character, but Williams plays a psychologist who helps Hunting throughout the movie.
Another one of his that you either loved or hated, World's Greatest Dad is extremely dark, and is one of my favorite of his comedies.
Not as critically acclaimed as some of the others, Hook still holds up quite well since its release. (Although, I liked Dustin Hoffman's Hook more than Williams' Peter Pan.)
This is my favorite Williams movie and the one people like to bash on the most. It follows the journey through the afterlife one man takes as he tries to find his wife.
I imagine you guys have all seen this but what's one more time? Everything about this movie is perfect. I don't even need to explain what it's about.
One of the earliest example of the impact an A-list celebrity can have on an animated picture, Aladdin would have succeeded without Williams. But, with him as the Genie, it became one of the all-time greats.
Clip (obviously "Friend Like Me"): https://www.youtube.com/watch?v=grVzHu-_LcU
Read more: http://imgur.com/gallery/QSHgh