S5·E27 Raspberry Ruckus
Aired September 26, 2010
Synopsis
Caillou thinks its hilarious when he teaches Rosie how to blow raspberries... much to his parents chagrin. When Rosie blows a raspberry at Caillous artwork during a preschool open house, Caillou finally realizes its not always appropriate... and decides hes going to be a better role model for his younger sister.