I'd never seen Monsters, Inc. - but a post-turkey Thanksgiving stupor was as good a reason as any to watch it.
I thought it was clever, though I suspect much of it was too sophisticated for smaller children. (Monsters are deployed through doors in the monster world to scare kids in the human world. An energy company, Monsters, Inc., harvests children's screams as energy. One day a little toddler accidentally crosses the threshold to the monster world.)
Boo, the little girl, was adorable. And the ending was wonderfully environmentally positive: instead of relying on energy based on fear and the collection of children's screams, the monsters make a complete U-turn and change to energy consumption based on laughter and fun. I approve.