I wonder how TSA expects to communicate the message to hearing-impaired or non-English speaking pax? Or do they assume that folks in these categories will blindly emulate the actions of everyone else around them?

Depending on the situation, my first instinct if everyone freezes and starts gawking is to move for cover, not to freeze and gawk, especially if I can't hear clearly, have headset/earphones on, terminal tape loops and CNN are blaring, I'm jet-lagged and tuning everything out....