Don't use my board game!

We have been playing a cool strategy board game that P got for his birthday. The other night P came down to the kitchen and found C & I playing the game by ourselves. He immediately took the board away (ruining our game) and told us we had no permission to use his game. I am still trying to decide whether it makes sense for me to have to ask P for permission to use his board games. After all, the kids use the "common" board games without permission... But that is not my point today. Instead, I told the kids how P could have handled the situation much better in the following way:

- Calmly tell C & I that he would prefer if we ask for permission before we use his board game.
- Asking if we could put it away, or at least move it away from the kitchen table where he was worried it would get dirty.

Basically, being polite he would achieved his goal without alienating us and making us feel that next time he asked us to play the game we might refuse... No matter what you want from people, in general, a polite accommodating request generates better results - not to mentioned that it is the proper thing to do regardless