Tangential but your comment reminded me: years ago (I hope this is no longer true) the iPhone would, when pinged via "Find my iPhone", play the alert sound to the current output.
So if my iPhone was playing music via AirPlay, the alert sound would go to, you guessed it, the AirPlay speakers. Completely pointless.
In a casino cardroom I once forgot to pick up my phone while I walked to a self-serve coffee station at least 30 yards away (with no walls in-between).
There was no disruption in the audio. In fact it didn't occur to me until I got back and saw my phone on the table that anything had even happened.
