The list of cognitive biases is my favorite Wikipedia page. And I quote:
Cognitive biases are tendencies to think in certain ways that can lead to systematic deviations from a standard of rationality or good judgment, and are often studied in psychology and behavioral economics.
In other words, a list of all the "bugs" in our brain that prevent us from thinking "correctly". What's interesting is that the list is so long. It says something about the human condition. And it explains how the seemingly infinite stupidity of mankind is possible.