Interesting As Facts by Christopher Kiss on Instagram: "Boo’s Voice Was Realer Than You Think The voice of Boo in Monsters, Inc. wasn’t delivered in a traditional studio setting with a child actor reading from a script. In fact, the actress who voiced her — Mary Gibbs — was just a toddler at the time and too young to read or take direction. To capture her authentic reactions and natural expressions, the Pixar team had to follow her around with a microphone as she played, laughed, and talked. Her