system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do happy things that are impossible (like winning $1T) not make us happy, but scary things that are obviously impossible genuinely scare us?
gpt
In the pass (Thousand of years ago) it was more beneficial to be scared of tiger/wolf that could be hiding in that bush in front of you. Then be happy of possibility that you will find tasty berries there.  
So people who genuinely were scared of "Imaginary/Impossible" things lived, and optimist were eaten.