Whats a movie/book/song that changed your perspective on something. How?

Once again im going to go with the song "Imagine" by John Lennon. It makes you get a whole new perspective on the world and how we view it. It really makes you think of what a perfect world would be like if everyone got along and agreed on everything. What if everyone agreed on religion? Government? War? Countries? What if everyone got what they wanted and were happy with the world? It makes you think of what if everyone was the same, such as race? It makes you think of a whole new world, what the possibillities could be if everyone just agreed. Just think about it and wonder... what if?