How do the workers work in Charlie and the Chocolate Factory by Roald Dahl?

Charlie and the Chocolate Factory by Roald Dahl tells of a boy who wins a tour of Willy Wonka's chocolate factory, which ultimately leads him to inherit the factory from its eccentric owner, Willy Wonka. The factory is manned by employees known as Oompa-Loompas. Oompa-Loompas are mysterious, but the book does provide some details about how they work.

The Oompa-Loompas are obviously hard workers. A large business that produces as much candy as Wonka Candy...

Charlie and the Chocolate Factory by Roald Dahl tells of a boy who wins a tour of Willy Wonka's chocolate factory, which ultimately leads him to inherit the factory from its eccentric owner, Willy Wonka. The factory is manned by employees known as Oompa-Loompas. Oompa-Loompas are mysterious, but the book does provide some details about how they work.

The Oompa-Loompas are obviously hard workers. A large business that produces as much candy as Wonka Candy does must have dedicated employees who are committed to their work, but that's not to say the Oompa-Loompas didn't also like to have fun while on the job. 

Willy Wonka says the following about his workers:

They're wonderful workers. They all speak English now. They love dancing and music. They are always making up songs.

It seems part of the Oompa-Loompa's love for fun on the job comes out through their mischievous behavior, including mocking disobedient kids and their parent through song. Willy Wonka warns those in the tour about the Oompa-Loompa's love for mischief, saying "I must warn you, though, that they are rather mischievous. They like jokes."