Once upon a time, there was a mouse. He was sad, because he wanted to eat his cheese. He couldn't jump higher, but his Didi could jump higher.
He called his Didi. His sister came, and asked him, "What happened? Why are you sad?" He told her that he wanted his cheese, but could not jump high.
His sister jumped up high enough and got him his cheese. He thanked his sister!
The moral of the story is that you should always help others.