What is your favorite phrase, saying, or quote expressed as code?

Question

Do not explicitly state your saying, in comments or otherwise. Your Code should express itself!

For example:

for (Person person : people) {
    if (!HouseTypeEnum.GLASS_HOUSE.equals(person.getResidence().getHouseType())){
        throw new StonesException();
    }
}

Answer 1

This simple expression is about as compact as I know...

2B || !2B

Or as a regex

/(bb|[^b]{2})/