Top X rules of Y

[Som1Lse]

So it's a simple game.
You simply post the top X rules of Y. (Where X is a number and Y is software/a game/a movie genre/whatever)

An example: (I wrote for a PM)
The top 10 rules of Game Maker:

1. Never name a variable/resource something starting with a number, and only use a-Z, 0-9 and "_".
   
2. Never write a string without quotes ('stringhere' and "stringhere"), or it will be treated as a variable.
   
3. Never add real and strings together. Use string(), and real().
   
4. A function can never alter or read from a variable by writing a variable name into it (like variable_local_exists(variable)) write it in quotes instead (like variable_local_exists('variable').
   
5. Extra resources (like data structures, 3d models etc.) can't be created like ds_list_read(list,string). You have to create it before (ds_list_create())
   
6. Never alter resources in use. It will only cause bugs.
   
7. random() can also return 0.
   
8. Never turn "Treat uninitialized variables as 0" on. It causes more problems than it hides.
   
9. Rooms and instances has a Creation code... In rooms its settings>Creation code. For instances its CTRL+Right click>Creation Code... (in room editor)
   
10. Instances and objects are NOT the same thing!
    

Guidelines:
Be creative, no one wants to hear all the LFE rules.
Use [list=1]
[*]Rule 1
[*]Rule 2
[/list] in your posts as they make it easier to read.
Have fun.

[Ragor]

Top 5 Rules of L4D
1.Teamkill the bots. They're useless.
2.Grief underage f*gs on mic. Gets the to leave.
3.Stick together. Good luck running from hordes while the others are bunched up in safety.
4.GRABBIN' PEELZ!
5.If possible, use minigun.

[Lauli]

Top 3 Rules of Fresh:

1. Thou shalt not be unfresh.
   
2. Somin, you so random.
   
3. Thou shalt not write rules about Fresh.

[Alblaka]

Top x Rules of playing the Medic:

1. Use the Medigun.
   
2. You're NOT supposed to heal heavies only.
   
3. Don't heal enemy spies, either.
   
4. As well, don't heal spies which are trying to infiltrate enemy teams.
   
5. Medic =/= Main Fighting Force
   
6. Do not waste an Uebercharge by dying... Waste it for whatever, but not for dying!
   
7. Use your uebers on teammates ned for specific tasks. Uberheavies will NOT win a longrange fight with sentrys.
   
8. Watch for spies and don't get stabbed!
   
9. Heal other medics.
   
10. Rape uncautious players with the uebersaw, exspecially dumb scouts.
    
11. Don't die while overdoing #10