Caillou makes a new cup for Mommy when he breaks her favorite one; Caillou, Leo and Clementine throw their teacher a surprise birthday party; a power outage happens while Sarah is over at Caillou's to play. "Caillou's Surprise" - It's a nice, peaceful morning and Caillou and his family are having breakfast. Caillou wants some juice and so Mommy suggests he get a glass out of the drainboard. Caillou decides he wants to drink out of a cup. He picks one up, but it's a bit too heavy for him and he ends up dropping it and breaking it. It turns out that this was a special cup that Grandma made for Mommy. Mommy's disappointed at the loss of her cup, but accidents happen. Still, Caillou's upset about breaking the cup. When Grandma arrives that day, he tells her about it. Grandma has an idea --- she's taking Caillou to the craft center today, and can create a new cup for Mommy there. They arrive at the craft center. Grandma gives Caillou an apron and they get down to work. Grandma's making a pot, while Caillou gets going on his cup. He imagines some other things to make out of clay --- a car, or even a flying car. He ends up getting splattered with the clay, but it's okay since he has the apron on. He rather likes working with the clay --- it's kind of like playing with mud. He finally gets the cup crafted and both he and Grandma put their creations in the kiln. Once they've baked, they paint them. Caillou's not happy with his colors --- they're dull and drab. Grandma tells him that they have to put it back in the oven in order for the colors to brighten. Caillou's rather dubious about this and he's not happy at having to wait for the clay to bake again. They'll have to come back for it tomorrow and Caillou wanted to give Mommy the cup today. Grandma advises him that some things are worth waiting for. The next day, Grandma and Caillou return to the craft center. Caillou is very pleased --- the colors on his cup are now very bright. Back at home, he tries to tempt Mommy wi