9 (Number)

9 is a number. 9 is a very important number, because when added to 6, it makes 15. When placed after a 6, however, that's when things get erotic. If you are a kid, look away right now! You can't see one half of sex! That's inappropriate!

Origin
One day, someone drew a 6 upside-down, and thought, "Nice." That's when 9 was born.