Check this site. I couldn’t help but chuckle at some of the stuff there. For those lazy enough not to click, here’s an excerpt:

1. Any body suspended in space will remain in space until made aware of its situation.
2. Any body in motion will tend to remain in motion until solid matter intervenes suddenly.
3. Any body passing through solid matter will leave a perforation conforming to its perimeter.
4. The time required for an object to fall twenty stories is greater than or equal to the time it takes for whoever knocked it off the ledge to spiral down twenty flights to attempt to capture it unbroken.
5. All principles of gravity are negated by fear.
6. As speed increases, objects can be in several places at once.
7. Certain bodies can pass through solid walls painted to resemble tunnel entrances; others cannot.
8. Any violent rearrangement of feline matter is impermanent.
9. Everything falls faster than an anvil.
10. For every vengeance there is an equal and opposite vengeance.

And my personal favorite, which shows what can be accomplished when you decide to make something that doesn’t follow the common sets of rules, but instead invents rules of it’s own: “Rules we obeyed in the Coyote/Road Runner Series”, from an autobiography of Chuck Young, creator of the Road Runner cartoons:

1. The Road Runner cannot harm the coyote except by going “Beep Beep!”
2. No outside force can harm the Coyote-only his own ineptitude or the failure of the ACME products.
3. The Coyote could stop anytime — IF he were not a fanatic. “A fanatic is one who redoubles his effort when he has forgotten his aim” -George Santayana.
4. No dialogue ever, except “Beep Beep!”
5. The road Runner must stay on the road — otherwise, logically, he would not be called Road Runner.
6. All Action must be confined to the natural environment of the two characters — the Southwest American desert.
7. All material, tools, weapons, or mechanical conveniences must be obtained from the ACME Corporation.
8. Whenever possible, make gravity the Coyote’s greatest enemy.
9. The Coyote is always more humiliated than harmed by his failures.
10. The audience’s sympathy must remain with the Coyote.

Be sure to check the link for more stuff, as well as examples for each of the laws.