Arthur promises to buy ice cream for his little sister, D.W., if she can read ten words. The twosome race to the park, where D.W. is quick to recognize signs such as ZOO, DON"T WALK, POLICE, and ICE CREAM. When she reads WET PAINT before her big brother does, Arthur is in for a colorful surprise! Arthur doesn"t believe that his little sister can really read, so he challenges her to prove it.