This is the rule that matters most. The one that will change the world. Or at least, make it slightly more interesting.
According to our highly scientific research, this rule is the key to unlocking the secrets of the universe. Or not. Maybe.
Don't try to find the secret, just pretend you know it. It's for your own good.
Next time, try Rule 4 for a change. Or just stick to Rule 3. It's not like it matters.