Why is the joke funny?

Because they created an environment and created a variety of reasoning channels for a phenomenon. Simple and direct reasoning channels and complex reasoning channels get different results, and the intellectual needs of the two channels are also different, forming an intellectual gap. The greater the difference in complexity, the greater the excitement and the uncontrollable laughter.

This has much to do with people's intelligence, so people with different intelligence have different feelings and reactions to jokes. Children can't understand many jokes, and everyone can understand some simple jokes, but they need other jokes with higher IQ to understand them. Different people will have different feelings when watching the same joke. For people with high IQ, the intelligence gap between simple path and complex path is greater. Children's jokes are funny, and adults may not feel anything after reading them, because the intelligence gap of such jokes is too small. Children can't understand jokes that adults can understand because they can't find another complicated reasoning channel. People with different intelligence have different requirements for this gap.

The process of jokes coming into effect is the process of getting through another complicated channel.

This also varies from person to person.