There are many rules for cats like door rule,chairs & rugs rule,Bathroom rules.
HAMPERING: If one of your humans is engaged in some close activity and the other is idle, stay with the busy one. This is called "helping", otherwise known as "hampering". Following are the rules for "hampering":
a) When supervising cooking, sit just behind the left heel of the cook. You cannot be seen and thereby stand a better chance of being stepped on and then picked up and comforted.
b) For book readers, get in close under the chin, between eyes and book, unless you can lie across the book itself.
c) When a human is holding the newspaper in front of him/her, be sure to jump on the back of the paper. They love to jump.
etc........