...yes, I know you are waiting to hear the usual story, good ole "fear itself", but no, I think the only thing we have to fear is the worst part of ourselves.

mmmm let's see;
-heights (well, put on hold, rather than overcome, through 15 years of training). I don't know if one can ever fully and completely overcome ones fears, more like control.
-public speaking (again, I'm not referring to a complete fix here, just a control through practice and facing the problem head on).

Those are the 2 biggies, I imagine others might have similar tales, and I look forward to reading them.