"Wai," he says. Cheerfully, with turned-up eyes (that is, not rolled, but squinched into black fish-shaped lashes by a smile), but it's still as though he's said, rather than squealed 'yay.'
Xel blinks at him. "That go boom?" Less permissable products being the only thing he's understood about that sentence.
If you know Discworld at all, read this. I'm telling you to in this particular thread for a reason. XD