Quoted from pinkid:Trying to play locked balls that are kicked out when the game is over.
I just had a friend over last weekend trying to do that, he said "something's wrong with the machine, the flippers aren't working!"
I just happened to be moving a pin from one room to the other that same day, and that same friend said "you'll have to remove the back legs to get it to clear the entryway". I proceeded to fold down the back-box with a grin and stated "this will probably be easier".
I also love it when guest's feed quarters into a game.