For GMs to be more precise, but everyone will have fun reading. See here for part. 1.

1. The only sessions, on which there is more fighting than in hack&slashes, are detective games.
2. At least one player knows the rules better than you do.
3. At least half of the players think they know rules better than you do.
4. The other half haven’t bought any dices yet.
5. The level of realism in fighting is inversely proportional to the number of fights.
6. The better prepared a character is, the less you know what to do with him.
7. It doesn’t matter how many times you have been to a toilet already, you will always need to go in the worst moment.
8. During your finest storytelling someone is going to start eating.
9. Electricity will be disconnected in a moment, in which it doesn’t make the atmosphere any better.
10. Players’ sense of humour rises inversely proportional to the seriousness of scene.
11. Best jokes are told in the worst moment.
12. If there was no joke, one of the players will start laughing without any reason.
13. If players are in great mood, they are not in a mood for gaming.
14. Players are always in a great mood.
15. If there is absolutely nothing to laugh at, players will start laughing at GM.

Probably will be continued…