Specified in the above box. I have hit my temple, the back of my head, my forehead, etc and I’ve done this twice at work and probably over 100 times over the years. Just in the past 6 months I would say under 10 times though.Thats an improvement from my past. It used to be a nightly thing to call off the toilet and hit my head on the sink. I did hot my head extremely hard 3 times in the past few months to where I felt it the next day and my short term memory is fading away from me more and more every day. My long term memory has always been a little foggy since I can even remember. 