(2009) Will Arthur figure out D.W.’s reading trick? D.W. makes a bet with Arthur that she can teach Baby Kate how to read in a single afternoon. The loser of the bet has to change their little sister’s stinky diapers! D.W. devises a clever trick to make sure she wins the bet. But will Arthur fall for it—or come up with a trick of his own before the next diaper change is needed?