Slug Club

"Anyway," said Hermione, continuing their interrupted conversation as though a lump of wood had not just attacked them, "Slughorn's going to have a Christmas party, Harry, and there's no way you'll be able to wriggle out of this one because he actually asked me to check your free evenings, so he could be sure to have it on a night you can come."

Harry groaned. Meanwhile, Ron, who was attempting to burst the pod in the bowl by putting both hands on it, standing up, and squashing it as hard as he could, said angrily, "And this is another party just for Slughorn's favorites, is it?"

"Just for the Slug Club, yes," said Hermione.

The pod flew out from under Ron's fingers and hit the green house glass, rebounding onto the back of Professor Sprout's head and knocking off her old, patched hat. Harry went to retrieve the pod; when he got back, Hermione was saying, "Look, I didn't make up the name 'Slug Club'—"

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Harry Potter and the Half Blood Prince Chapter 14: Felix Felicis