Quoted from Chisox:
i think he's talking about the sounds that modern games make when the game is on but not being played. For example when I press the flipper buttons on my Road Show when it's in attract mode it makes the sound of thunder. Which always freaks me out when I accidentally hit the button while fixing the game next to it.
Yes! Especially when the room is quite and your least expecting it! I've jumped a few times. (what the F..., oh just the attract sound) lol