today i have noticed something about jokes.

Insulting jokes are made up of 3 parts, one of which is usually hidden.

Part 1: Usually hidden, or exists as contextual knowledge. This establishes a trait in the subject one would like to joke about, usually by exaggerating the trait. Most people only find out about this when they understand the joke.

Part 2: Usually the longest part of the joke. Can be a story or a one liner. This usually describes the situation the subject is that, such that he can bring out his trait.

Part 3: Also known as the punchline. This shows the exaggerated trait in the subject involved in the given situation.

Example: Your mother so fat, that when she jump for joy, she get stuck.

Part 1: Your mother is so fat

Part 2: That when she jump for joy

Part 3: She get stuck.

In this case, the subject is "your mother". The fact that "she gets stuck" when "she jump for joy" shows that she is "fat".

Another example:

Why do racists compete with others on the basis of colour?
Because if they competed on brains, they'd lose.

The subject is "racist". The fact that "they'd lose" when they "compete on brains" shows that they are stupid.