I did dirt jump tracks on BMX before skating. I also grew up with motorcycles, guns, dune buggy, 4 wheelers, etc. I would say, to X degree, I had "No Fear"™ but.. when handrails started getting bigger, I definitely started feeling it. I would think "handrails aren't fun" but also "man if I get broke off, I won't be able to skate". So... unironically... a handrail (at 32 years old) is the thing that brought out the fear in me and took away my "No Fear"™.
Long story medium... there was a horizontal rail in between cement posts that was kind of low. I thought it would look cool to 50-50 from one side and pop off to the other, a transfer, if you will. I did it a few times, but wanted to film it. Got on the rail and the board banana peeled out from under me so all my momentum went forward full speed and started going down on my face. I snuck my hands in between my face and ground (I had just got my teeth fixed a week before this). On film.. I got up and laughed, because the pain hadn't hit me yet. He cuts the cam, and then this searing pain shot up both my wrists (jammed both straight into the ground). I still have 3 pops in my left wrist and 1 pop in my right, from this one fall. Confidence on rails shot instantly. I only KINDA skate my Zero flat bar sometimes, but I hate rails. I still hate this moment, because I knew within a week that "the fear" had gotten me and I would never return to my previous self (please read this in a "Wonder Years" narrative voice).