Not really. I don't feel I have deep dark side.
But, I am meaner/less reasonable when stressed, outraged,or if cornered.
I may have some fleeting thoughts of wanting to punch someone or do something else dark,but nothing deep dark because,honestly that repels me.
However,If you judged me on those "dark" thoughts you would know very little about me.
However ,if a person is mostly dark with very little light, I would know a lot about them.
It isn't as easy to hide darkness nor light in a person.
If a person is exceptionally kind or exceptionally horrible we see it quite clearly after awhile.
My theory is most of us dwell in between light and darkness.
I think we need to be light to push away the darkness that creeps in.