After an autistic savant inherits three million dollars from his deceased father, his younger brother, in an attempt to trick him out of the money, learns some valuable lessons of life. Selfish yuppie Charlie Babbitt's father left a fortune to his savant brother Raymond and a pittance to Charlie; they travel cross-country.
Charlie: This is a good one. We don't go out when it rains, this is a real good one. I hope you appreciate this because my business is going down the fucking toilet. I should be in L.A., instead I'm in the Honeymoon Haven motel in Bumblefuck, Missouri because you won't go out when it rains. Mystifying. Fucking mystifying.
For most of us, it's difficult to imagine having any major handicaps or mental problems. We really don't think about the people that do have those problems because they only seem like images on TV and in movies. "Rain Man" is a good, touching story that proves those people do exist and we learn a lot about life from those who live simple ones.