Here's why the metaphor works:
* Goldfish have short memories: It's a common misconception that goldfish only have a three-second memory. While their memory isn't very long, it's not as short as that. However, they do have a limited attention span and are easily distracted.
* The metaphor is relatable: Everyone can relate to the experience of forgetting things or losing focus easily. The image of a goldfish flitting around a tank, seemingly forgetting what it was doing moments ago, is a humorous and relatable way to describe this experience.
Examples of using the phrase:
* "My brother has a mind like a goldfish. He can't remember where he put his keys five minutes after he puts them down."
* "I tried to explain the project to her, but she just stared at me blankly. I guess her mind was like a goldfish."
It's important to note that:
* While the phrase is often used in a humorous or lighthearted way, it can also be used in a more critical or insulting manner.
* It's not a scientific term and should not be used to diagnose or describe any medical conditions.
If you're concerned about your own or someone else's attention span or memory, it's best to consult a medical professional.