Actually, I have! Just yesterday. I also participate in a weekly meme called Teaser Tuesdays, and I added some of the quotes I have used as teasers to Common Knowledge.
As for quotes I know by heart, I can remember going to the theater to see The Fellowship of the Ring and thinking to myself, “That’s not how that line goes!” and being annoyed that they left out little gems like “Here’s a pretty hobbit skin to wrap an elvin princeling in.”
One of my other favorites – and I think I will make a point of adding it today, is from Oscar Wilde’s The Picture of Dorian Gray: “There is only one thing in the world worse than being talked about, and that is not being talked about.”