This has no doubt been posted before, but it took me by surprise, so I thought that I would post it. A few days ago my iPad was on charge, with the smart cover closed and hence in sleep mode, and we had the tv on. Suddenly, after about an hour watching something or other, I forget what, Siri suddenly announced to the effect of 'what can I do for you?' somewhat loudly. Puzzled, it took me a while to realise that something spoken on the tv sounded near enough to 'hey Siri' (-Syria, perhaps), which I had enabled when we first bought the iPad. (Actually since then I have hardly used Siri.) Interestingly, later on I put the iPad on charge again and tried 'hey Siri': it seems not to respond to a UK accent! Hey Siri has now been disabled!.