The physical functions of human beings which do not depend on our control , naturally occur in the case of everyone, these are the call of nature. However, in the traditional way, urination and pressure of the toilet is called the call of nature. Because there is a fear of embarrassment or rudeness in speaking these words in front of others. The word bathroom is also common. In many cases, to make fun of themselves, they say big outside , small outside. If someone asks permission again, they ask for number one or number two.