This is a short video of Youtuber lilmul123 playing a game of Af-Tor at the 2014 Michigan Pinball Expo when the ball gets stuck bouncing perfectly back and forth between a bumper and kicker. He says it went on for several minutes before the bumper's solenoid eventually burnt out. Wait -- so you let it sit there doing this for a couple minutes instead of nudging the machine? Was this your grand plan for a high score? Because now the machine's busted. And -- AND -- you filmed in portrait mode! You should have stayed in bed that morning.
Keep going for the actual video. Unless portrait mode really bothers you, then you might want to skip it.
Thanks to JS, who is a real pinball wizard and has the pointy hat with the stars and moons on it to prove it.