It's worth noting that on U.K. iPhones, Siri's default voice is that of a male and not female like it is in the U.S. So you'll have to picture Siri cursing the poor boy out with a male British accent.
What is the purpose of Siri?
Siri is a built-in "intelligent assistant" that enables users of Apple iPhone 4S and later and newer iPad and iPod Touch devices to speak natural language voice commands in order to operate the mobile device and its apps.
Is Siri as good as you?
Siri is powered by some very interesting technology, which tries to understand not just your words but your sentences. Understanding meaning is a lot trickier than just identifying words. It's improved a lot with iOS 9, too. No longer is Siri a separate module within iOS, or one that exists merely because it's cool.