Quoted from kwiKimart:
No tilting and no bang-backs.
"No tilting" doesn't even make sense as a rule. It's there inherently to prevent damage to the machine, so if you want people to not nudge/bump it, just set the tilt extremely tight and let it do it's thing. Maybe more of a general statement "If you are rough with the machine, you will loose your balls."...
If your tilt is disabled...well....whose fault is THAT?