Then she came back a little later and reminded me again because she noticed that the red light on my noise reducing headphones was still on, even though I had taken them off my ears and they were hanging loosely around my neck.

FORBES: A Few Key Differences Between Southwest and Delta

If the noise wanes or Data starts seeing red, he changes the direction of his set and tries out different material.

WSJ: Heather Knight and Data: A Researcher and a Robot Walk Into a Bar... | Creating