There is a complex psychological theory behind what makes people laugh, which is called the incongruity theory of humor. This theory suggests that humor is based on the principle of incongruity, or the mismatch between what we expect to happen and what actually happens. When we encounter something that is unexpected or breaks the rules of logic, it creates a feeling of incongruity, which can lead to laughter. This theory suggests that people find things funny when they go against their expectations, violate social norms, or are just plain absurd. In short, we laugh because something is unexpected or doesn't make sense.
