Quoted from Rondogg:Parents need to make sure these little darlings don't press a four player game, play one ball and walk away. I will say I didn't see crazy monkey flipping, which was nice...
This happened to me on Diner in the free play room. Thought about re-starting the machine, but did not think that would be cool on someone else's machine. Had to waste 11 balls to get back to a 1 player fresh game. I can't say the 4 player was done on purpose, just did not know what button to push to start I bet.