I like to imagine that we all have this imaginary care cup that contains how much we give a flying flipper about things that occur in our lives. Throughout the day, the cup gradually empties as you care less and less about things.
If you look at everyday people, you can usually tell where their care cup is at in that particular moment.
Then there are folks whose care cup is just straight up empty. I'm talking nothing. No Frick Fracks left to give.