Corrected entry: When Sully, Boo, and Mike are riding the door and Boo screams, only one door is activated. When she laughs in the same scene, every single door is activated. Near the end of the movie it is revealed that laughter is 10X more powerful than screams. In that case, only 10 doors should have been activated from her laugh.
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Correction: Far too speculative. Clearly a child screaming must be able to power more than a single door, otherwise the activities at Monsters Inc. would be pointless, as it would take the same amount of power to collect a scream as that scream would later provide. There are far too many factors that go unaddressed in the film to make any definitive statement. For example, we know nothing about the comparable effective ranges of a scream and a laugh. From what we see in the film, a laugh can clearly provide power over a very large area, whereas a scream appears far more limited. It may simply be that the single door was the only one close enough to Boo to be powered by her scream, but when she laughed, there was enough power to fire up every door within range.
Tailkinker ★