Mommy sends Caillou to play outside because he's making too much noise and it's Rosie's nap time. Caillou notices all the loud sounds outside, especially Daddy's lawnmower, and the recycling truck. Daddy says he knows a sound that's even louder than those sounds, and takes Caillou to a road near the airport. Daddy was right - the planes taking off overhead are really, really, really loud! Caillou imagines he's a pilot of one of those planes.