I used to like the Cyclone I played back at Uni calling out "hey you with the face". Could be quite funny if it happened to randomly coincide with when someone was walking past it.
Yeah, could scare a person if it was cranked up nice and loud.
Back when Black Knight was released and speech in pinball was new, the S was hard to synthesise. Anyone walking past a loud BK would get an earful of "I will lay you, my enemy".
