Though Siri is at best a middling distraction on the iPhone 4S for most of us, it's nevertheless an incredible piece of technology. Advanced voice recognition, sophisticated artificial intelligence, a smattering of humorous responses... But what we didn't know is that Siri actually has a mind of its own and is on a mission to “kill the humans."  Something that we find out in this hilarious spoof movie trailer, 'Siri: The Holiday Horror Movie'.