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I know what you mean. I had to hold on to the bottom of a train bridge theat was at the least 300 feet above the land Bellow as a train went by. It was hard time hold onto a bridge that shook as if an earthquake was active. Ever sense I have had a hard time with higher places unless there is something to hold onto .... However I don't think this qualifies as a "stupid fear"

I guess you're right; maybe it's more like a rational fear. But mine kicks in a bit sooner than what would probably be rational :P

I hear ya!