I think he blew it

The thing with unwritten rules is that you can never go back and say to someone:
“Look – it says right here you shouldn’t have done that.”
I always thought that was because unwritten rules were so obvious that no-one would break them and there would be no need for any chastising or clarification (Darwin Awards nominees aside, obviously):
Don’t poke that tiger. Don’t touch that wire. Don’t chew on that razor blade.
Let’s be honest, it’s pretty straightforward stuff. But ignoring unwritten rules can result in consequences far worse than the traumatic amputation of your arm, a nasty electric shock or bleeding gums. Yes, really.

Take kids’ birthday parties as an example: An opportunity for a few mothers to get together and have a chat and a glass of wine, while the toddlers play happily with each other, eat sand and generally have a good time. Everyone wins. Especially since while the cat is away, the mice will play. And this proverbial mouse takes the opportunity to play FIFA 07 without fear of interruption from anyone asking you to make them a cup of tea and mow the lawn or anyone (slightly smaller) tugging the power cable out of the back of the PS2 and eating it. It’s a near perfect situation.
Or at least, it was until the Saturday just past.

That’s when someone tinkered with the system. Upset the equilibrium. Broke the unwritten rule.

It would be wrong of me to name and shame the person in question. He knows who he is. What he doesn’t realise, perhaps, is that with his attendance of a kids birthday party on Saturday morning, he has opened the floodgates. With him turning up, suddenly the rest of us have no excuse to avoid forthcoming events of this nature.
My wife was hardly through the door, a filthy but happy Alex in her arms, when she piped up, “[name] was there too – you should come along to the next one!”
At first I thought it was a bluff: no-one would be guilty of such folly – especially [name] – would they?
Sadly, my hopes were dashed – apparently [name] was indeed there and won admiration and brownie points deluxe from the assembled mothers at the party. Good work, sir.

The question is, will that reward be worth it when he meets all the fathers at the next one…?