Life changing ideas?

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So i was watching this movie yesterday where a computer geek in high school comes up with an idea of his life time and with his knowledge on computers and supports from his friends he makes the most popular website of all time.. which happens to be worth in billions now. i liked the movie and i was thinking to myself that i should try something like that.. then i stopped for a several reason. 1. I am not a computer geekk. 2. Most of all the cool ideas are already taken. 3. I should start being practical and focus on my studies. lol So anyways.. Do you ever think like coming up with a nice idea that would make you billionaire in a no time? if so what would it be if you dont mind sharing it with us. PS: The movie that i was watching was 'The social network' i believe its a true story and The movie is about the website FACEBOOK.