That urp urp urp noise a dog or cat makes before it vomits. . . usually in the middle of the night when you are sound asleep. I swear no one would ever sleep thru their alarm if that was the sound programmed to wake you up.
As far as pinball goes, the sound of "No Flashdrive Detected" (or something similar) coming from my Pinsound Card after I've just installed a new flash drive with a new sound package.