Here’s how secret voice commands in YouTube videos could hijack your smartphone | PCWorld

A muffled voice hidden in an innocuous YouTube video could issue commands to a nearby smartphone without you even knowing it.

Source: Here’s how secret voice commands in YouTube videos could hijack your smartphone | PCWorld

Also consider researchers found they could monitor vibrations of someone typing on a keyboard with a smartphone placed on the same surface as keyboard and determine what the person was typing.  I guess  we will have to remain aware when someone sets their smartphone down next to us.