Question
Monsters Inc publicity still

In "Monsters, Inc.," what's Boo's nickname for Sulley?

Last updated: November 2, 2025

Pixar's "Monsters, Inc." gave us furry monsters, giant slugs, and cyclopes who all scared children to power their city. But despite their fuel source, the citizens of Monstropolis are terrified of kids. Their worst nightmare comes true when three-year-old Boo wanders out of her bedroom and into the world of monsters, where she runs into Sulley, the top scarer. She quickly grows fond of him, even giggling at his roars. What does Boo call Sulley throughout the movie?

Correct Answer: Kitty

(Source)

Most three-year-olds see an eight-foot-tall blue creature with purple spots and think "this thing could bench press my mom's car," but Boo just saw an oversized house cat. That's right, Monsters, Inc.'s top scarer for multiple months running was being treated like a big 'ol tabby, or I guess big young tabby would be more accurate since she called him "Kitty." The animators at Pixar made sure Sulley's reactions to being called "Kitty" captured that mix of confusion and growing affection that comes from being completely disarmed by a fearless toddler. The real Boo was Mary Gibbs, daughter of Pixar animator Rob Gibbs, and at only two years old at the time of recording, her genuine excitement for her lines helped make every giggle and "Kitty!" feel all the more wholesome.

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