A German couple have a baby and name him Claus. As time goes by Claus grows up and yet never utters a word. After years of trying to find out what is wrong with him, his parents just accept that he's mute.

On Claus's 14th birthday he is given a slice of his favourite cake. Suddenly, Claus turns to his Mother and says "Mother zis cake is dry".

Overcome with emotion at his new verbal state his mother rushes to him and cries,"Claus, you can speak. Why have you never spoken before?"

"Well", Claus replies, "up until now, everything has been satisfactory"