It's common knowledge that Apple has a rather dry, sarcastic sense of humour when it comes to some of the responses that their automated assistant, Siri, gives to the user. But it seems they weren't a fan of the assistant's Wolfram-reliant response to the question "What is the best smartphone ever?"
So they have changed it rather rapidly from the original answer of the Nokia Lumia 900 to one of two sarcastic responses: "the one you're holding" and "you're kidding, right?"
Why was this peculiar aforementioned answer given previous to the patch? Wolfram Alpha had categorised the Lumia 900 the best due to its catalog of four reviews, each giving the device five stars. While it is a brilliant device, Apple were not impressed. Do a search on Wolfram Alpha separate to Siri and this answer is still there, so it appears that Cupertino have just turned a blind eye to the service. Take that "knowledge engine!"