Restless and irritable, Ron had developed an annoying habit of playing with the Deluminator in his pocket; This particularly infuriated Hermione, who was whiling away the wait for Kreacher by studying The Tales of Beedle the Bard and did not ap-preciate the way the lights kept flashing on and off.
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She was infuriated by his rude behavior.
it infuriated me to think that not too long ago I, like this boy, had foolishly played the clown.