You've probably seen reports on how Siri was telling the world that Nokia's Lumia 900 was the best smartphone ever.
She was simply relaying a response provided by the Wolfram Alpha computational knowledge engine which averaged customer reviews across the web.
But Apple has taught Siri better so she now replies with "You're kidding, right?" or "The one you're holding in your hand" or somesuch response.
Needles to say, Nokia wasn't too happy and was quick to accuse Apple of recalibrating Siri, tarnishing her credibility in the process. As if Nokia didn't have other worries on its mind, mind you...