So what happened here? You were guilty of a bias that we all have called The Hindsight Bias. Hindsight bias, also known as the “knew-it-all-along effect”, is the inclination to see events that have already occurred as being more predictable than they were before they took place. Hindsight bias causes you to view events as more predictable than they really are. After an event, people often believe that they knew the outcome of the event before it actually happened.