Hi Cracker,
If your TV is announcing everything you do, the Voice Guide feature is likely turned on. This is an accessibility function designed to assist users who are visually impaired, and it may have been activated accidentally by holding down the Volume button on your remote.
To turn off Voice Guide, go to: Home > left directional key > Settings > All Settings > General & Privacy > Accessibility > Voice Guide Settings > Voice Guide = OFF
~Samsung Advisor