" What do you think that fish is?' Sam asked Astrid.
She peered closely at the alleged fish. 'I think that's an example of Pesce inedibilis,' she said.
'Yeah?' Sam made a face. 'Do you think it's okay to eat?'
Astrid sighed theatrically. 'Pesce inedibilis? Inedible? Joke, duh. Try to keep up, Sam, I made that really easy for you.'
Sam smiled. 'You know, a real genius would have known I wouldn't get it. Ergo, you are not a real genius. Hah. That's right. I threw down an 'ergo.''
She gave him a pitying look. 'That's very impressive, Sam. Especially from a boy who has twenty-two different uses for the word 'dude. "

― Michael Grant , Lies (Gone, #3)