something that is i think “known” to sometimes happen on Black Hole – on mine it happens about 1 out of 100 times: The player goes to the lower playfield, but fails to open the Re-entry Gate (by knocking down a set of drop targets). This is supposed to result in the ball shooting up the Re-entry Tube on the right side, and out the right outlane into the drain. But every once in a while, it shoots up the tube with enough velocity to careen all the way across the area behind the flippers against the apron, and back into play through the left side near the pop bumper. (i’ve also heard some people say it can pop back into play between the flippers, but mine doesn’t seem to do that).
It’s a wonderful feeling when it happens, because it immediately reverses the EXTREME frustration of the lower playfield punishing you with a drain. (love that design, by the way).