Mad Troll: I couldn't take it! Thumping! Not thumping! Me brain's gone potty! AAAAAAAAARGH! Get them off me, they're all green!
Mad Troll: [gurgling] WIBBLE!
Rincewind: Yes, look, let's not pursue that, shall we?
Mad Troll: [deathly whisper] It's very delicate, you know.
Rincewind: How do you change voices like that?
Mad Troll: Change it like what? [high-pitched, gibbering] Mene, mene, tekel upharsin!
Rincewind: You did it just then!
Mad Troll: [normal voice] It's called bucketing.
Rincewind: Channeling?
Mad Troll: No, bucketing. It's like channeling, only it doesn't drain away afterwards. It all just sort of sloshes around in there and dribbles out at random.
