If you read/watch a lot of science fiction, you may notice that in general it makes practically no sense. Every rule has its convenient exceptions, the most basic tenets about the universe are constantly ignored or questioned, and there always seem to be more explosions and life-saving coincidences than real life could possibly support. However, we readerly types know that, buried in this mass of general wibbly-wobbley mish-mash and spacetime-continuum paradoxes, a kernel of beautiful common sense lies. The following is a list of the sci-fi rules one should always follow, no matter where in the universe you are.
1. Always keep a towel with you. Towels can save your life in a million unexpected ways.
2. Turn left.
3. If you come to a door, shoot the control panel. Whether you want the door to close or open, it will. Mostly guaranteed.
4. Don't kiss someone without first making absolutely certain that he/she isn't your long-lost twin.
5. Don't worry if you don't know the language. If anything important is being said, it'll be in English subtitles. Or a translator droid will be handy. Or you can just put a certain type of fish in your ear that will magically translate everything. You know, whatever floats your jet pack.
6. Be careful. Anything could literally explode at any minute. Also, you might be walking into a trap. Also, shortcuts are rarely short and are never a good idea unless you're the adventurous and invincible main character who needs to keep things suspenseful, in which case... Well, things will get suspenseful.
7. If you hear a helicopter, that means somebody's dead. This either means your life is now slightly easier, or it means you've lost your very best friend in the whole universe.
8. Time travel is generally stupid. Seriously, don't go back in time and try to fix things that already happened. But if you do, at least don't go anywhere near your parents.
9. Never Ever Ever Wear a Red Shirt. Red shirts are dangerous.
10. And whatever you do, DON'T BLINK!
May the Force be with you. ;)