Movies are about entertainment, learning and emotions. We all go to the movies and remember the songs, dialogues, movie sequences, fashion, actors/actresses, locations, etc. It is an overall experience of fiction and reality.
Dialogues like, “kuch kuch hota hai Rahul, tum nahi samjhoge” from 'Kuch Kuch Hota Hai', “I love you Naina” from 'Kal Ho Naa Ho' and many more are remembered and will stay evergreen in the minds of people.
Movies are not only about a great script or a great star cast or great music or big sets, but it is about those simple dialogues and their delivery at the right time.
People relate to these dialogues with their own lives and even get inspired to a large extent. It is the impact made by the words and emotions of the dialogue that makes it go viral and people all over use it in their regular conversations.