What metaphors are used in Artemis Fowl by Eoin Colfer?

Metaphor:

“What's this?" he inquired, none too pleasantly. "A circus?" "No, Julius. It's the end of the circus." "I see. And these are the clowns?" Foaly's head poked through the doorway. "Pardon me for interrupting your extended circus metaphor, but what the hell is that?”