On all the pumps near me, the second from the top on the right side mutes the video. Some gas station attendants or kind customers thought to write "Mute" on the button in sharpie, and I encourage everyone to do the same.
I wouldn't condone vandalism -- despite however justified you may feel it is, plus it would have the opposite effect: I don't want whoever create those demon machines to know we know where the mute button is.
