1. All flying machines explode instantly upon contact with any body of water, except those which double as submarines.

2. The physical performance of a vehicle is based on the environment it looks like it belongs in, not the one it actually inhabits. Hence, spaceships bank when they turn, but only if they look like planes.

3. There is a direct relationship between the moral virtue of an individual and the magazine capacity of his firearms.

4. In space, everyone can hear you scream.

5. All computers are operated by two-man crews: young nerds who actually operate the computer, and old technophobic officers who stand over their shoulders saying things like "enhance the image" and "blow it up" and "get me everything you've got on the guy in the trenchcoat."

6. In the future, accents are no longer tied to geographical origin.

7. The farther back in history you go, the more likely you are to encounter people with posh London accents, no matter where you are in the world.

8. All societies, all over the world, for all of history, have been multiracial. For instance, there were Japanese centurions in the Roman army.

9. Species that evolved completely independently on separate worlds are mutually attracted and can breed together.

10. Men like women with primary-color skin.

11. If you are mysteriously transported outside your normal environs, you will become a hero.

12. All planets have gravity of approximately 1g.

Feel free to add to this list, but no copying from other sites. I'm looking for the ones I haven't read yet.

13. People can just strap a helmet over their head(s) and walk on a planet with zero atmosphere, even though that would kill anybody.

14. All Roman soldiers were centurions.

15. Romans talked with British accents, except for some of the good ones, who talk with American accents.

16. No woman has ever been happy with an arranged marriage.

17. It is common practice to jail prisoners of opposite sexes together, and/or to have attractive prisoners guarded by members of the opposite sex.

18. Sons of kings only usurp the throne in countries that are evil overall. Brothers of kings can usurp the throne anywhere.

19. The cynics always survive.

20. All cars screech when they're in a chase scene.

21. The guns in westerns are the only ones with awesome ricochet sounds, regardless of what they actually hit.

22. If there is a big button, someone will inevitably push it.

23. All linguists speak every language.

24. Don't trust anyone wearing black or red.

25. Animals make better allies than humans.

26. Tall things were made to be jumped off of.

27. If the door's locked, fire your laser gun into the keypad and the door will open.

28. Slave girls always zero in on the hero and get him to buy their freedom for them.

29. Girls are never bought or sold as slaves for non-sexual purposes.

30. In the future, money will be called "credits." Everywhere. Different currencies will be distinguished by attaching their issuing government: "Republic Credits," "Federation Credits," etc.

31. Loan sharks that run large criminal underworlds can be identified by their weight.

32. Pirates are really just noble, freedom-loving folk oppressed by a narrow-minded government that's bigoted against thieves, rapists, and murderers.

33. All large military operations, complexes, or devices can be conveniently destroyed by pressing one prominent button on the control panel. Often this is not protected by so much as a password.

34. Step mothers are only evil in fairy tales, but are good if they're Evangealine in Nanny McPhee.

35. People don't think you weird if you suddenly break out into a song and dance with a random invisible orchestra accompanying you. In fact, they may join you.

Those should be 34 and 35. But other than that, those are great. Especially the second one.

Oops. Thought I changed it. *fixes* it's confusing when people post so fast!

36. All people living in tribes are either highly superstitious or your biggest fans.

'Tis OK. I figured we'd have some numbering problems.

37. Girls, especially princesses, are the most likely to be able to talk with animals. They tend to make them their friends by singing to them.

38. Girls tend to discover and believe magical worlds more than boys, esp. when the boys are siblings.

39. In the future, names will become less popular. Instead, things will be identified by elevating a common noun to name status, and capitalizing it, e.g. the Republic, the Empire, the Federation, the Senate.

40. Laser beams move at approximately the speed of an arrow.

41. Even on remote worlds that no one in his right mind has the slightest inclination to travel to and few people even know exist, you can find a decent demographic sample of the universe in any given bar. And there's usually an ace pilot there too.

42. Spaceships have glass windows.

43. No woman ever listens when her male companion tells her to stay behind for her own safety. Not even if he knocks her unconscious to make sure.

44. The guy with the bigger army always loses.

45. Every girl fantasizes about being a princess, except actual princesses, who hate it.

These are hilarious!

46. Never trust a captain named Jack.

47. The best spies are world-famous for their work and always use their real names.

48. Semi-automatic handguns are likely to become revolvers and vice versa at unpredictable times.

49. When faced with an unknown danger in an unfamiliar location, it is common knowledge that the best strategy is for the party to split up. This strategy appears tailored to maximize the probability of reducing viewer confusion by eliminating excess characters.

50. Large spaceships (the ones that don't look like airplanes) are designed just like ships. Even to the point of never attacking other ships or defending themselves from above or below.

51. Trust everyone named James.

52. The smaller a person is, the more ninja-like and dangerous they will be.

53. Even though a typical revolver may appear to hold only six rounds of ammunition, if you keep pulling the trigger bullets will continue firing indefinitely.

54. Bad guys have terrible aim; however, on the off-chance they do land a shot, it will be to a non-vital area.

55. Everyone in Spartacus's army was named Spartacus.

56. Peasants always sang "We Will Rock You" during jousting tournaments.

What kind of movies do you watch?

57. Boomerangs return as faithfully as a golden retriever.

58. Villains have a tendency to laugh loudly before getting kill or shot by a hero who's standing in front of him, saying: "Wrong."

59. Villains hate white. XD

Hahah. Sparticus and A Knight's Tale, but with parental editing.

60. Democracies/republics are next to useless as they are mired in red tape, bureaucratic waste, and petty legislative squabbling.

61. Democracy is the highest of all human goods.

62. Supposed monsters either turn out to be man-made machines or fighting only to protect their love.

63. If you're an important character, you'll survive large explosions, even though the heat and power would fry and obliterate those around you.

64. Robots are always bad news, unless their name is Sonny.

65. The future will be white and controlled by technology.

Heehee, some of these are quite amusing.

66. Monsters or trouble always appear off of the port-bow of a ship.

@Nemo: A Knight's Tale is awesome!! Jacob edited the movie and burned it to disc so we can watch it safely all the time.

67. The cynics are always right.

68. Bombs always have a screen with bright red countdown numbers.

69. You can always get a new mobile phone in the next scene if you drop/blew up/microwaved/broke/blended/drowned your last one.

70. There are never enough life boats.

71.
If you are trapped on an island with killer dinosaurs, and you are not
 A. an important scientist who's been here before,
 B. a child,
 C. his father, or
 D. his mother,
then you're not going to make it off the island alive.

72. Computer mice and spacebars are purely decorative.

73. All straight-A students in elementary school have teched-out treehouses, regardless of whether their families are wealthy or not. Apparently they got a treehouse scholarship.

You can trust captain Jack Harkness.

74. You never run out of ammo, until the movie wants you to!

75. Aliens always want to destroy earth, or save it.

Oh yeah? What was his profession before he met the Doctor, again?

You smart man! But you can trust him now!

A con man.

~

76. Babies are never abandoned on doorsteps unless they're going to become a) the hero, b) the villain, or c) another extremely important person.

77. Evil Villain's minions always fail at the evil laugh.

78. Batman. Is. Awesomeness.

79:Day-old wounds that had one stumbling around and in peril yesterday are of no consequence today. They will not in any way stop you from running for miles/fighting the entire police force/leaping on your friend when they bring you news.
80:It's always a good idea to marry in secret.
81:Friars are always going to go along with your plot.
82:It's perfectly natural to propose to someone the night you meet them.
83:If your true love dies at a young age, you'll have no qualms about killing yourself to join them. (Because, of course, there's no future without them. Besides, it's not like you have a loving family or any other friends or something like that.)
84:Potent poison is easily aquired at your neighbourhood drugstore.

Who can tell that I've been watching Romeo and Juliet?

Those are funny...

85. The villains always have haphazard aim

86. Bots are ALWAYS good. Except when they're bad.

Remember to number them, people!

86. Talking with your mouth full is okay (as long as you do it delicately) because you have to keep the dialog moving.

87. If a body wasn't discovered, he's not dead.

88. All military facilities are equipped with a large button that blows up the entire building. It has only the most minimal of security features, and sometimes none at all.

89. If your parents have a rule you don't agree with, the best strategy is to break it. Most likely they will realize the error of their ways and apologize to you.

90. All female journalists are "intrepid."

Good ones!

91. When you are searching for someone who recently disappeared, and you find a torn article of his clothing, the best course of action is to call off the search, hold a funeral for him, think of him as dead, and be thoroughly surprised when he comes home alive and well.

:megarofl: Hahahahaha! That's so funny!

I know, right?