You take an idea.
Stretch it.
Explore it.
Kill and resurrect it more times than our Lord and Saviour.
You spend more time on it than on your health.
It may affect your relationship.
Your dietary habits may dip.
Some may never get laid.
All because they want to exaggerate the importance of an idea they are infatuated with.
The focusing illusion states that: Nothing in life is as important as you think it is while you are thinking about it.
Thinking requires focus.
Ergo, to think is to exaggerate.