According to the American Film Institute, it's the fourth most memorable quote from any movie ever made. It's so memorable, in fact, that it's been used (and corrupted) in numerous other movies and television shows. Which one am I talking about? Here, take a look. It's first utterance is right at the very beginning. (WARNING: Some naughty language that you may not want your grandmother to hear. If she's not around, go ahead.)
So, where did they all come from? Go take a look at the list on the creator's blog.