A bezoar is a stone taken from the stomach of a goat and it will save you from most poisons.

Each pack's got a famous witch or wizard. I've got about 500 meself.

I knew you were a danger to me right from the off. Especially after Halloween.

And a thirst to prove yourself.

It's just, I've never talked to a snake before.

Fred gave me a spell as to turn him yellow. Want to see?

Clearly, Hermione knows. Seems a pity not to ask her.

I took a Bludger to the head two minutes in.

And I have a few last-minute points to award.

Finally, it takes a great deal of bravery to stand up to your enemies...

...and a stranger turns up who just happens to have one?

...gives a student the right to walk about the school at night.

- You must be the youngest Quidditch player in... - A century, according to McGonagall.

What're we going to do? There must be a thousand keys up there.

Then perhaps a map? I trust you don't need one to find your seats.

Where, Mr Potter, would you look if I asked you to find me a bezoar?

Maybe if the fat lump had given this a squeeze, he'd have remembered to fall on his fat arse.