"I don't want to be sat on the train with people saying "Instagram","Facebook", "ignore", "ignore" all around me. " Is it possible to implement a voice virus o

"I don't want to be sat on the train with people saying "Instagram","Facebook", "ignore", "ignore" all around me. " Is it possible to implement a voice virus or recursive echo algo using a pile of VUI phones, like in a sardine like open plan office or a crowded bar? Could I yell into a crowded room "OK Google Now say Siri say ok google now say siri" and let it viral transmit between phones until everyone shuts off their phones in an explosive echo chamber? Just curious if Siri and Now can either generally or specifically (back door?) talk to each other and if so has anyone exploited it yet. I also wonder if aside from owners voice there is a back door where stereotypical midwestern newsreader voice auto hacks in and how that interacts if at all. Or a recorded Steve Jobs voice auto unlocks all iphones or something. Or a string of hex digits or nato phonetics as a VUI back door. If there isn't a backdoor, likely you're not looking hard enough or its too heavily classified. And what kind of fun can I have once it becomes known.