Maybe I overreacted, but darn it, you do not touch a pinball machine that someone else is playing. You stay out of the player's line of sight, and you give him or her enough room to work the machine. But pinball machines are so rare, and youngsters only play video games, where putting "English" on the machine isn't generally possible, and so I guess they don't learn.
I bought a total of five credits on that machine ($2). I walked away about two hours later, having played a whole lot more than five games, although I lost track of how many overall I won. However, I'm not likely to go back there to play that same machine, because the machine is in poor condition and it's rather remarkable I was able to win as many games as I did with so many broken targets.