Identify the type of irony used in the following excerpt:
(from J. K. Rowling's Harry Potter series)
Why were you lurking under our window?
Yes yes, good point, Petunia! What were you doing under our windows, boy?
Listening to the news, said Harry in a resigned voice.
His aunt and uncle exchanged looks of outrage.
Listening to the news! Again?
Well, it changes every day, you see, said Harry.