It begins with Caillou's Mommy and Caillou ready to leave the house to go somewere. Caillou suddenly has to go the bathroom. Before getting there Caillou finds his toy car and plays with it until Caillou's Daddy finds him and asks what he he doing. Caillou remembers he has to go to the bathroom and now has to go really bad. While in the bathroom Caillou plays with a box pretending its an airplane until Caillou's Daddy remids him that Caillou's Mommy is waiting Caillou gets down stairs but its no longer raining but he and Caillou's Mommy both take were their water boots because there's still a lot of puddles outside.
- The bathroom that Caillou uses isn't the on normaly seen on the show (The one were Caillou takes a bath in Caillou in the bathtub and in other episodes). It only appears in this episode sometimes it is called the secret room or the mystery bathroom.