A bed of talking begonias in a psychiatric hospital? Good idea.
One moment all was quiet, and the next, a disembodied voice was bellowing from somewhere in the vicinity of the begonias. Strictly speaking, it wasn't actually addressing me, and I know this because it said: "this is a no smoking area. Please put your cigarette out. A member of staff has been informed" and I gave up smoking six weeks ago.
If all this catches on it creates a huge opportunity for the urban terrorist. A few cheap boom-boxes left in crowded places, some tapes of absurd bellowed instructions, havoc.