What should you say? (English subtitles available)

Bobo is a very rude puppet. She does not say sorry to her friend, Ken, when she is late one day. Ken gets very angry. Bobo then goes to ask Aunt Mary what to do. Aunt Mary is an agony aunt. She helps children solve their problems. She advises Bobo to make an apology to Ken. Bobo understands that she should learn to be polite. She says sorry to Ken and they become friends again. Aunt Mary also helps Little Bill. He is afraid to talk to his teacher. She sends Bobo to give Little Bill a box. What is inside the box? How can it help Little Bill to talk to his teacher?