What were Ron and Hermione doing in the girl's bathroom?

What is used to cure those petrified?

What holiday does Professor Lockhart insist everyone celebrate?

What does Hermione give Ron and Harry that is intended to keep Crabbe and Goyle away while they use the transformation potions?

When Harry found Justin Finch-Fletchley and Nearly-Headless Nick immobile after the attack, someone suddenly appeared. Can you remember who?

Into what does the transformation potion turn Hermione?

Who bewitched the bludger in The Rogue Bludger?

Parseltongue is an uncommon gift.

What does Harry put in Goyle's cauldron as a distraction during Potions Class?

How long ago was the Chamber of Secrets first opened?