What is a real-life example of hindsight bias?

An example of hindsight bias in real life is how easy a test might seem after we know the correct answers.

Suppose you are uncertain about the answer in a multiple choice test question. You are not sure if it’s A or B, but eventually you choose B. When the teacher mentions that the correct answer is indeed B, your first reaction might be “I knew it was B all along.” In other words, you might feel more confident about your knowledge after you hear the correct answer.