Sampling Bias
A boy found a four-leaf clover. When he got home, he decided to find out how rare they actually are. He went online, and looked it up. It turns out they're actually pretty common, and only seem rare. The boy was crushed.
The boy was crushed. He went online, and looked it up. A boy found a four-leaf clover. When he got home, he decided to find out how rare they actually are. It turns out they're actually pretty common, and only seem rare.