That's a tough question. There are quite a few good ones. If I had to choose just one I would probably have to go with Scarface.
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"I know, honey. Look at the map. We go your way, that's about four inches. We go my way, it's an inch and a half. You wanna pay for the extra gas?"
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"Film is a disease. When it infects your bloodstream it takes over as the number one hormone. It bosses the enzymes, directs the pineal gland, plays Iago to your psyche. As with heroin, the antidote to Film is more Film." - Frank Capra