" Without thinking, [Will] spoke.
'Halt? Are you awake?'
'No.' The ill humor in the one-word reply was unmistakable.
'Oh. Sorry.'
'Shut up.'
He pondered whether to apologize again and decided this would go against the instruction to shut up, so remained silent. "
― John Flanagan , The Emperor of Nihon-Ja (Ranger's Apprentice, #10)