"I've got it!" shouted George gleefully. "I've found the antidote for the poison on the book!" George punched the air before looking back at the list of ingredients, muttering to himself. "Graphorn horn… We've got that. Fire seeds… We can nick those off Snape…" George looked across at his smirking brother. "Looks like we're going to have to take a trip to Myrtle's bathroom, Freddie."
The twins sneaked down the long corridor to where the girls bathroom was, George carrying the equipment in a cauldron, and Fred keeping an eye out for other students or teachers. It was lunchtime, so there shouldn't be too many people roaming the corridors, but they had to be careful anyway. They reached the bathroom, and slid through the door. Ron had told them that no one ever went in here, and they knew that he and his friends had made potions in here before. They dumped their equipment, and the books, and left the bathroom again, locking the door from the outside with a quiet "Colloportus.". "Okay, so tonight, I'll come back here, and start on the potion, and you get Harry's invisibility cloak and nick the rest of the ingredients from Snape." said George. "Sounds like a plan." replied Fred. Little did they know that their plan had been overheard by someone who immediately vowed to interrupt their little 'potion party' in the worst way possible.