Here are some movies that are very different from the book.
Breakfast at Tiffany's- Considered as one of the best romance movies of all time but the source material is not a romance.
The movie is about a writer who have writer's block who fell in love with an Escort girl. He loved her for who she is and saved her from the life of prostitution. Well any man will fall in love with someone who looks like Audrey Hepburn, she plays a prostitute on this movie and she still looks classy.
In the book, The writer is Gay! and his relationship with the woman is not romantic. It is about friendship between a Gay man and a woman who is rejected by society. When it got adapted into a movie, they turn him straight and turn the friendship into romance.
I know what you did last summer

In the movie a group of teenagers drove under the influence and they accidentally hit a man. They thought he is dead so they throw away his body in the ocean. Little did they know he survived and he wanted revenge. He will them one by one.

In the book their car hits a child, and they buried the body. The father of the child tried to find them one by one to kill them.
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IT

The movie is about a group of children called the losers, The losers are being haunted by Pennywise, A killer clown entity who eats and kill children.In the movie after killing Pennywise the children made a blood pack so they can escape his world.
In the book they had sex so they will lose their innocence because as long as they are innocent they will be stuck on his realm.... I am so happy the movie never followed the novel.
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