How to describe a person with a bad brain humorously?

Humor describes a person's bad brain in the following ways:

1, the brain is kidnapped by aliens, and the stars are flashing.

The brain is like a dictionary, which is full of mistakes and mysteries.

3, it's really harder to understand than conch, at least conch can keep turning.

4, so smart, donate your brain quickly, then you can immediately change the national IQ ranking.