One of the main new features on the iPhone 4S is its voice activated virtual assistant, Siri, which you can ask question and it will respond to you, we have already seen a couple of videos of Siri in action.
Joshua Topolsky, from This is My Next, has been playing about with Siri, and considering some of the answers he has received it would appear that Siri, or someone at Apple may have a sense of humor.
