final scene in Casablanca

No. 2: "Louis, I think this is the beginning of a beautiful friendship"

The Writer's Guild of America has named 1942's "Casablanca" as the greatest screenplay ever written. It is likely also the most quotable film of all time, with lines so familiar to us, such as, "Here's looking at you, kid," "We'll always have Paris," "Round up the usual suspects," "Of all the gin joints in all the world, she had to walk into mine," and, of course, "Play it, Sam."

Even though that last line -- perhaps the most famous from the film -- is often misquoted as "Play it again, Sam."

The film can be viewed as a piece of propaganda used to prepare Americans for the self-sacrifice that was needed to defeat the Nazis in World War II.

The two main characters, Ilsa and Rick, must choose between making their own lives happy or the world's. They chose the world, but director Michael Curtiz still had to choose what the final note would be -- bitter, or sweet.

Having lost his old love but gained a new friend, Humphrey Bogart's famous last line helped give the audience hope that their sacrifices would ultimately pay off.

Last up, just click your heels together three times and say ...

cast of the Wizard of Oz

No. 1: "There's no place like home"

Just like there is no place like home, there's just no film like "The Wizard of Oz." Generation after generation continues to enjoy the 1939 gem, one of the most beloved films in American history.

What continually draws us to Dorothy's adventures in Oz? For many of us, the last line not only conjures up our memories of the film itself, but of our own childhood.

Perhaps we were sitting on our grandpa's lap the first we saw the film, or huddled around the TV with our cousins on Thanksgiving while the smells of baking turkey permeated the air.

But wherever we were when we first saw "The Wizard of Oz," we were likely surrounded by loved ones when we did.

When we hear the last line quoted, we are likely to think of those loved ones and the more innocent time in which we first heard it, which makes "There's no place like home" not just the greatest last line of all time, but perhaps the greatest and truest sentiment of all.