CNN video launches Siri by accident
Using iPhone 6, iOS 8.1.3. Plug in your phone to a charger and watch the video below from CNN. In the first minute or so the reporter says "and Ceres" which then invokes Siri. It's not a big deal but someone on a malicious site could say "Hey Siri dial 1-800-555-1212". I don't think the microphone should be on while playing certain application videos/sounds. Now to be fair, you are not able to say "Hey Siri" and something complex. As soon as the phone hears "Hey Siri", you don't have much time to add anything else as Siri kicks in. But I am sure someone who plays with this long enough would be able to find more interesting things to do.
As a side note, you don't always need to have the phone plugged in for this to work. Twice now I have been able to invoke Siri with this video without being plugged in to anything. That's a bug in iOS I would think.
http://www.cnn.com/videos/us/2015/02/21/nasa-dawn-mission-to-ceres-orig.cnn-nasa
iPhone 6, iOS 8.1.3