=> For example: Hearing someone mispronounce a word or use the wrong word makes us laugh

- The incongruity theory: The incongruity theory suggests that humor arises from unexpected, inappropriate, or illogical situations. According to the Incongruity Theory, a joke becomes funny when we anticipate that one thing will happen or be said, but something else does instead. When the joke gose in an unexpected direction, we experience two sets of incompatible thoughts and emotions - the ones we had as we were listening and the ones revealed at the end. This incongruity makes us laugh.

=>  For example: A man goes to a psychiatrist and says, “Doctor, I’m worried about my brother. He thinks he’s a chicken”. “That is serious “, says the doctor. “ Why don’t you put him in a mental hospital?”. So the man says, “ I would, but I need the eggs.”

- The relief theory: This theory holds that there are certain things we feel tense about, such as bodify functions, physical attractions, and shame about how we look. It is believed that the large number of jokes about those subjects come from our news to laugh about them and thus relieve or reduce our tension about them. According to the Incongruity Theory, humor is a feeling of relief that comes from the removal of tension.  

=> For example: When tension is high, we need a release, and laughter is a way to cleanse our system of the built-up tension