"Crazy Bus" (also known as "The Crazy Bus Song") is D.W.'s most favorite song that was written by Arthur writer Joe Fallon. However, her brother Arthur dislikes the song just as much as he dislikes her favorite show, Mary Moo Cow, and he claims that "Crazy Bus" is the worst song ever written, due to the fact that D.W. plays it constantly at his expense. However, D.W. disagrees with Arthur, and says that it is the greatest song ever written. The song was first heard in Buster Baxter, Cat Saver, and has been recycled in some subsequent segments. In the French dub, it was entitled as "No-no bus".