What is great minds think alike?

The phrase "Great minds think alike" is a proverb that suggests when two or more intelligent people come up with the same idea, it's a sign that the idea has merit. It implies that shared ideas are a validation of intelligence.

However, it's often used ironically, or as a playful response when someone else expresses the same thought or makes the same suggestion, implying that both individuals are part of the group of "great minds". It can also be used humorously to deflate egos when someone has an obvious or common idea.

The phrase doesn't always imply agreement in general, but rather a coincidence of thought in a specific instance. It's a lighthearted acknowledgment of shared thinking. A common rejoinder is "Fools seldom differ," a more cynical observation that implies only unintelligent people agree with one another. So, the phrase highlights both agreement and intelligence concepts.