We were having a conversation with cousins who live about 100 miles from us, about jobs. Cousin said that he had to walk on pipes at a paper plant (before OSHA) that were quite high up. I commented I was afraid of heights and that when I am really feeling the height, my feet hurt AND he KNEW what I was talking about.
I will admit my family (sibs and parents) have for years made fun of this little oddity I have - the feet hurting - not the phobia. So it isn't in my head, it's in my genes!
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