If anyone on any social site does not have a picture of themselves, its automatically means they are fat and ugly

In the bourbon community, Rule 10 prohibits negative opinions from being given unless such thoughts were solicited. It's the play nice or go home rule. It potentially encourages whiskey tater behavior and convinces others to buy very poor choices based on the posters high praise of said bottle with no negative feedback from others. As a work around, commenters will often post 'Rule 10' to express their belief said bottle does not deserve such praise.

Any person that one thinks is interested in them, is not.

According to the Rule of 10, No one is allowed to call someone after 10pm or before 10am unless it is absolutely Important.

When two friends of opposite sexes are simply friends and not fuck buddies or whatever people fantasize about in their twisted heads.

One must be ten percent smarter than the object/task one is attempting to use/accomplish.

For instance, pushing a pull door or failing at some other seemingly simple task.

When a seemingly incompatible couple is married quickly, then subsequently announce that they are 14 weeks pregnant only 10 weeks after the wedding night.