It's a Secret! is a 1988 Sesame Street storybook featuring Bert. Bert is looking for new bottle caps to add to his collection. He gets all his friends on Sesame Street to help him look. They ask how many he has, and he says "more than 100". They push to find out how many. Embarassed he runs away and confesses to Ernie that he can't count any higher than 100. He asks Ernie not to tell anyone because it is a secret.