What happened in Half-Blood Prince when Dumbledore introduced Horace Slughorn at the start-of-term feast?

• He announced that Slughorn was to be the new Head of Slytherin
• He announced that Slughorn would be the new Defence Against the Dark Arts teacher
• He announced that Slughorn would be the new Potions teacher
• Slughorn interrupted him and asked to say a few words

Your New Favorite Thing

Magnetic Particle Testing: Principles And Practice Quiz

How Much Do You Really Know About the Northern Lights?

When Will You Retire?

Fixing Your Credit Math With A Quiz

The magical spells vs. magical creatures quiz

What happened next: Yule Ball edition