Chuck Jones rule

As in other cartoons, the Road Runner and the coyote follow the laws of cartoon physics. For example, the Road Runner has the ability to enter the painted image of a cave, while the coyote cannot (unless there is an opening through which he can fall). Sometimes, however, this is reversed, and the Road Runner can bust through a painting of a broken bridge and continue on his way, while the Coyote will instead enter the mirage painting and fall down the precipice of the cliff where the bridge is out. Sometimes the coyote is allowed to hang in midair until he realizes that he is about to plummet into a chasm (a process occasionally referred to elsewhere as Road-Runnering or Wile E. Coyote moment). The coyote can overtake rocks (or cannons) which fall before he does, and end up being squashed by them. If a chase sequence happens upon a cliff, the Road Runner is not affected by gravity, whereas the Coyote will realize his error eventually and fall to the earth below. A chase sequence that happens upon railroad tracks will always result in the Coyote being run over by a train. If the Coyote uses an explosive (for instance, dynamite) that is triggered by a mechanism that is supposed to force the explosive in a forward motion toward its target, the actual mechanism itself will always shoot forward, leaving the explosive behind to blow up right in the Coyote's face. Similarly, a complex apparatus that is supposed to propel an object forward or trigger a trap, will not work on the Road Runner but always only on the Coyote. For instance, the Road Runner can jump up and down on the trigger of a large animal trap, and eat bird seed off of it, but go completely unharmed and not set off the trap, but when the Coyote places the tiniest droplet of oil on the trigger, the trap snaps shut on him without fail.
some of the rules that should be followed in a wile coyote cartoon is;

• the road runner cannot harm or upset coyote except by going 'MEEP! MEEP!'.
• no out side force can harm the coyote, only his own ineptitude or the failure of acme products.
• the coyote could stop anytime - if he were not a fanatic.
• no dialogue ever except 'MEEP! MEEP!'.
• the road runner must stay on the road - other wise, logically he would not be called road runner.
• all action must be confined to the natural environment of the two characters - the south west american desert.
• all materials tools, weapons or mechanical conveniences must be obtained from acme corporation.
• when ever possible make gravity the coyotes greatest enemy, the coyote is always more humiliated than harmed by his failure.