My much simpler rules:

Adult rules:
* No food
* Drinks allowed--be careful
* Pre-credit up only as much as you are playing (Press right coin reject to 'insert coin')

Kid rules:
* Wash hands before going downstairs
* No food
* No drink
* Pre-credit up only as much as you are playing (Press right coin reject to 'insert coin')
* No banging on the monitor (videogame) or playfield glass.

In the end, what happens?
Adults:
Coin rejects pushed in way too far, undoing glue or popping springs off the left one that shouldn't be pushed
One drink enevitably gets spilled every couple parties on the blacklight carpet
Tons of extra credits loaded on the games all over, freezing the video games on a single screen for those that don't continue attract.

Kids:
Same issue on coin rejects
No drink issues
Food still makes it down, chip cumbs or stuff on the floor randomly
TONS of extra credits
Pin left with a ball or two left to play occassionally.

In otherwords, doesn't matter how simple your rules are, they still will be violated regardless of age.

On video games, it often stops the attract mode sequence, freezing the screen and burning in the text onto the CRT phosphors. At least the attract modes only burn in the score at the top of the screen, the rest continues to display and change. I often replace really burned in tubes with scavenged tubes from 1980's Television sets, and they're getting harder to find, so I hate when a game is locked on a "21 Credits" screen without demoing what the game does to those that are waking by.

At least when I power off a video game, it clears the credits. On the pin, they come back, and what happens is people start multiplayer games when they only intend to start one, then walk away once they get annoyed their 'good ball' went against another players score.