Don't mind old Peeves up here, floating around and popping the Potions Master's bubbles with many jabs of his index fingers. Pop. Pop. POP. Pop-pop-pop-pOp-PoP-POP.

What? Oh yes, Peevesy's good deed for the day. He drew himself up and inhaled a big, important breath, ready to announce the next steps which would, of course nEVER cause any exploding cauldrons or (very funny) treachery. No. He was a changed poltergeist. He was turning a new leaf. He was rather enjoying the possibility that they may refuse his very helpful help just because they didn't trust him. But, alas, they listened.

Well, Peeves was bored of this superpower nonsense anyway. All these disruptions ought to belong to him and him alone.

And there was always the chance the potion would explode by accident. Wouldn't THAT be funny?

"NEXT: Add one cup of crushed unicorn horn-" A whole cup! "-one single Ashwinder egg, one heart of crocodile, and half an avocado WITH the stone. Stir anticlockwise until it turns... ah..." What was it now? Peeves squinted around at everyone. Green for Ssssslytherins? No. Gold? Noooo... Pinkpurplegreenblue? Oh. "Silver!" Hehe.

And he'd have the other half of the avocado, once they were done with it. Mr Potions Man would look rather fetching with it splatted up against his ear.