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Fun Facts About 'Monsters, Inc.' That Will Make You Love It Even Harder

5. The song Boo sings on the potty is an original.

“They told me to sing and I started singing 'Wheels on the Bus,' but they couldn’t use any actual songs [because of] copyright issues so they had me babble and sing random words for a few hours and took out the parts they liked the best!” revealed Mary Gibbs (who voiced Boo) in an interview.

If you listen closely, parts of the song sound like “Tale as Old as Time” from Beauty and the Beast.