10. If you are a female cop, DO NOT have sex with the hero. You will be shot soon after.
11. Do not go near a nail gun.
12. Do not take off your helmet to wipe your brow. That is a sure sign there is a sniper in the neighbourhood.
13. If you are a villain, do not chase the hero into a factory, especially if he is wounded. You will fall into a vat of molten metal. Trust me.
14. if you are the villain, do not attempt to shoot the hero anywhere near a prostitute. There are two things you need to know about prostitutes: a) They all have 10 year old asthmatic sons who are doing well at school. b) they all have hearts of gold, and will shoot you to save the hero even though they themselves will have to die before the end of the movie so that the hero can get off with the heroine.
15. Do not wave that bloody gun around for dramatic effect. it WILL go off and shoot someone. Probably you.
16. Do not say anything racist, sexist, or homophobic. Holywood morality states that you will have to die to teach the audience a lesson.
17. For God's sake, if you have the hero in your gunsight, just shoot the bastard. Do not spend 10 minutes making a speech. He will use the time to work his hands free of the bonds and grab a wrench which he will throw at you, knocking you off balance. Just shoot him and be done with it.