The quote I have chosen is from the film "Harry Potter and the Philosopher's Stone" and it's from Hermione Granger. This film was released in 2001. It was directed by Chris Columbus and produced by David Heyman. The music wasa composed by John Williams and it''s based in J.K Rowling's books. It's a British film stared by Daniel Radcliffe, Emma Watson and Rupert Grint. 

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In the scene, we can see Harry Potter, Ron Weasley and Hermione Granger after trying to get into a secret room with a Cerberus inside. They are in Gryffindor's common room talking and they are going to go to bed. Before going to bed, Hermione says the famous quote. The meaning of it is alerting Harry and Ron for not retorning to that room because they are going to get killed or expelled, that it's something Granger wants to avoid.

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I have chosen that sentence because Harry Potter is one of my favourite sagas and this quote is iconic in the 1st film. I had been doubting between others, but I think that this one is special because real fans know it all by heart, included me. Apart from that, Emma Watson has been exelent for the sceen and this makes the quote better.