I was in a small plane once. I had taken a three-day course on parachute jumping. I was attempting to cure my acrophobia.
I was so scared that I waited for the LAST of our class. But, there was an odd number so I in the next class--ADVANCED jumpers. I was to jump at 1,800 feet.
The plane went up to
10,000 feet.
So, the hot shot parachuters jumped and we descended DOWN to 1,800 feet again for my jump. I put my left foot out on the strut, right leg dangling and held on to the wing of the plane. I was told "JUMP!"
I couldn't jump so I just LET GO and down I went. The instructor said that I had a big smile on my face and was WHITE as a ghost from terror.
The free fall was six seconds and in those six seconds my mind had gone BLANK. If I had fallen to the ground I wouldn't have known it.
Then the chute opened; I spun round and round; got hold of the straps for direction and steadied my descent.
I landed on my feet and fell back on my butt. I rolled up the chute and waited for the truck to pick me up.
I lost my fear of heights. After all these decades I still have no fear of heights.
It worked!
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Hair of the dog.