I Like This Ball
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Harry: I like this ball.
Oliver Wood: Ah, you like it now. Just wait. It's wicked fast, and damn near impossible to see.
Harry: What do I do with it?
Oliver Wood: You catch it, before the other team's seeker. You catch this, the game's over. You catch this, Potter, and we win.

Oliver shows Harry the Golden Snitch and explains it's significance.