((Pretty long, but bear with me; it's worth it. These are shamelessly ripped from www.librarium-online.com))
1. Thou shalt not refer to the Adeptus Soritas as "Bolter *****es," nor shalt thou go anywhere near our sisters during the time of the "Red Rage," lest thou wishes to be the first human to enter orbit without the aid of a shuttle.
2. Orks are not "cute."
4. Thou shalt not replace the Librarian's staff with a magic wand.
5. Thou shalt not tip the Terminators over during battle.
6. Thou shalt not do Spock impersonations around Eldar.
8. Thou shalt not dare others to eat Squigs.
9. No, you cannot "take the Titan for a spin."
10. Thou shalt not use thy multi-meltas to light campfires. (in a similar manner, thou shalt not use the Terminator Captain's chainfist to open tins of baked beans)
13. The Chapter Master is not a "drag."
15. Thou shalt not ask a Sister if you might "donate some of your own Gene-Seed."
16. Thou shalt not throw soap at nurglings.
17. Thou shalt not put a "kick me" sign on the Golden Throne.
18. Thou shalt not refer to the Machine Spirit as "Cruise Control".
19. Thou shalt not stick a 'Honk if you think I'm sexy' sticker on the Sisters' Rhino.
20. Thou shalt not honk if thy sees a sticker saying 'Honk if you think I'm sexy' on a Sister's Rhino.
22. Thou shalt not make the Emperor read your palms, or call upon him as "Miss Cleo".
26. Thou shalt not spread cooking oil in front of a dreadnaught.
27. Thou shalt not attempt to shake the chaplain’s hand whilst wearing a powerfist.
28. Putting sand inside the terminators’ armour is not “funny�.
35. Thou shalt not let an Ork be the designated driver
36. Thou shalt not replace the holy ungents for the machine spirit with grain alcohol
45. Thou shalt not throw a warp beast a dog biscuit.
50. Thou shalt not wear oven mitts when issued a plasma gun.
51. Thou shalt not take the rhino to procure monkish ale before filling out His Most Holy acquisitions forms.
53. Thou shalt not refer to the flamer as a “novelty toaster�
54. Thou shalt not ask the apothecary to guess what you have eaten by looking at your tongue.
55. Thou shalt not remove the motors from a terminators' suit during battle.
57. Thou shalt not break wind in the presence of the emperor (unless properly addressed to do so)
62. Thou shalt not instigate a "my Primarch could beat up your primarch" debate.
65. No hair pulling when enjoying brotherly contests with the space wolves.
67. Thou shalt not punt grots for pleasure.
68. Thou shalt not shout “thongs for the thong god" in front of the Dark Eldar lest thou wishes to learn the true meaning of pain.
69. Thou shalt not debate the protective merits of purple spandex with the Dark Eldar.
71. Power armour never makes a sister look fat.
77. Thou shalt not ask roughriders if you can pet their ponies.
80. Thou shalt not in any way, shape, or form, take the land speeder joy riding.
81. Remember, shining lasguns in the guards’ eyes is WRONG.
82. Thou shalt not pretend to have been possessed by a daemon.
84. Yes, it will be noticed if you 'borrow' the chapter master's equipment.
86. It is not "cool" to feed snotlings copious amounts of narcotics.
87. It is not “funny� to dress up as a bloodletter and jump out in front of the chapter master.
90. Playing naughty movies in your power armour’s autosenses is not sanctioned by the Adeptus Astartes.
91. Thou shalt not teleport into the Sisters showering facilities.
93. Thou shalt not commandeer droppods to go for pizza.
97. Thou shalt not follow a Librarian around thinking "Can you hear me now".
105. Thou shalt not do doughnuts in a rhino, unless thou wishest to clean the passenger's vomit from the floor.
108. Tyranids are not "cute".
109. Thou shalt not use lasguns as laser sights for thy bolters.
118. Thou shalt not ask a space wolf if he wants a biscuit.
119. Thou shalt not eat another marine’s paste.
120. Thou shalt not trip a dark angel in front of a interrogator-chaplain.
121. Thou shalt not trip an interrogator-chaplain.
123. Scouts are not 'target practice'.
124. Thou shalt not replace the Chapter Master's weapon with a plastic sword.
125. It is not funny to put an 'Eat me' sign on the Librarian's back prior to a Tyranid attack.
132. Thou shalt not eat prunes before a battle
148. Thou shalt not tuant the Imperial Guard with threats of utilizing a lascannon upon their posteriors in an unnatural fashion.
149. Thou shalt NEVER, under any circumstances, interrupt a navigator's concentration during warp travel to ask him if you "are there yet."
153. Thou shalt not use the chapter standard to dry thy undergarments upon
154. If a Tyranid does not respond to external stimuli, thou shalt not attempt to poke it with a stick.
169. Enforcing discipline is not sending the neophytes to procur strong monkish ale.
195. Thou shalt not distract our Librarian whilst he attempts to cast Smite lest thou be forced to clean the inside of his helmet.
207. Raid is compleatly usless against a carnifex.
215. Thou shalt not mention the phrase "bath time" in front of the space wolves.
225. Thou shalt not fry ants with the meltagun.
230. Thou shalt not blame the chapel heating for falling asleep during prayer.
237. Thou shalt not procur noisemarine weapons for thine garage band.
247. Thou shalt not attempt to procur "the good stuff" from thine apothecary.
258. Thou shalt not use thy techpriest's tools to unblock thine holy toilet.
271. Thou shalt not refer to Magneus Calgar as 'Papa Smurf'
287. Thou shalt not make comparisons between Night Haunter and Batman.
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