Carnival of the Animals
This is another joke, because “pianists” are people who play the piano, they are not animals. Saint-Saëns makes them seem rather stupid as they practise their scales. When this movement was first published, a note was included that said that "Performers should imitate the playing of beginners, and their awkwardness". Because of this, in some performances, the pianists become out of time with each other on purpose.