Multi ball. Airball Flys into the slingshot after being activated by another ball. Happens more than you'd think.
On some Classic Ballys I have seen finish nails placed under the slingshots. . . likely to keep balls from getting stuck back in the day.
I'm betting the ball de-materialized from the DW down the row and re-materialized in this game.
Good news the plastic did not shatter.
My favorite is when you realize a ball is missing and you find one stuck to the speaker magnet. Was it YOUR ball or an extra one in the game and your ball is still stuck on the PF somewhere. There's no WAY you an have that much fun in Pacman. Pinball is awesome!
ThT happens on my AC/DC Vault edition all the time. And only the sling under the cannon.
i operate many of my games, so if i have one that does this often enough, i'll do what lloyd said and replace the standard 2 1/2" slingshot rubber w a 2". doesn't seem to have much gameplay effect, but saves me from having to open it up and recover the ball 3X a day.
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