Unexpectedly, this can sometimes be a positive too. "Hey siri, turn my lights <pink/orange/purple/blue/red/white>" has on multiple occasions been interpreted as "Hey siri, turn my lights", which then results in the lights being turned off. This is hugely entertaining when you're demonstrating your new Philips Hue bulbs over FaceTime, and the person on the other end now just sees your camera go black instead.