Clause: a legal binding or document accorrding to the law.
You are legally obligated to not get up when a cat gets on your lap. You sign any responsiblities away because you have a cat on you lap. You legally can't do anything because there is a cat on your lap. "The clause states you are free to leave once the cat leaves your lap on it's own accord not your own."
"Sorry I can't get up I have Cat Clause."
"But I have Cat Clause."
"No honey I can't do this dishes, I have Cat Clause"
"Can you do it for me I have Cat Clause"