Here is a lesson How (not) to lose 100 times more than you risk. This moron sold NAKED Tesla calls when the stock went vertical for $4.50 and bought them back for $410. At least he has a positive attitude about the ordeal. Funniest comments: "The only reason why I would go to the gym after losing 140K is to get more weights for the noose." What we learnt here is: Instead of naked options, he could have sold vertical calls, where his losses would have been predetermined and limited.
"They" never learn. Happens over and over and... First thing I learned when trading options was to use a risk grapher. Unlimited-risk trades have never seemed like a good idea to me.
Years ago when I was in securities school to get my Series 7 license... the instructor made it a point to pound the notion into our heads... "writer, seller, short". I can still recall seeing him harp on that. In recent years there have been a few big time naked call writers who have had their head handed to them... and I'll bet there are several more who got nailed in Tesla.
From what I know, Volatility is underpriced. You can make money 99% of the time selling it. But you will get rekt 1% of the time being naked.