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Take WALL-E, for example, which was known, early on, as Trash Planet. For a long time, that movie ended with our googly-eyed trash compactor robot saving his beloved droid, EVE, from destruction in a dumpster. But there was something about that ending that nagged, that never quite felt right. We had countless discussions about it, but Andrew Stanton, the director, was having difficulty putting his finger on what was wrong, let alone finding a solution. The confusing thing was that the romantic plotline seemed right. Of course WALL-E would save EVE—he’d fallen in love with her the moment he saw her. In a sense, that was precisely the flaw. And it was Brad Bird who pointed that out to Andrew in a Braintrust meeting. “You’ve denied your audience the moment they’ve been waiting for,” he said, “the moment where EVE throws away all her programming and goes all out to save WALL-E. Give it to them. The audience wants it.” As soon as Brad said that, it was like: Bing! After the meeting, Andrew went off and wrote an entirely new ending in which EVE saves WALL-E, and at the next screening, there wasn’t a dry eye in the house.
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Ed Catmull (Creativity, Inc.: Overcoming the Unseen Forces That Stand in the Way of True Inspiration)