Hindsight Bias

You cannot know what’s going happen while it’s happening. In literature (or film, or any scripted story) it’s generally predictable. But down here where we live — in real life — the unpredictable cannot be predicted.

A Hindsight Bias is a term used in psychology where one may tend to overestimate their own ability to have predicted an outcome of a scenario that could not possibly have been predicted.

Example, “I knew this would happen!”

No, you didn’t. If you knew it was going to happen, then why were you not prepared and accepting of it happening? Why are you surprised at its occurrence?

More meaningful explanation in the Wiki and some good examples here.