I got a Nikon Coolpix L830 for my birthday.
Started to read the 204 page instruction manual online. It has a function called 'pet portrait' where you point & frame the shot and as soon as it detects a cat or dog it shoots 3 frames without you pressing the button!
Ever spookier it has 'smart portrait' where you frame a persons face & nothing happens until they smile. Then and only then it takes a photo!
Tried (the latter) function on my beautiful No 2 daughter. It works when she smiled showing teeth or not, but no other facial expression would trigger it.
I'm slightly scared of it!