What is your rational phobia?
In a resent Conversation, "Are you left-handed?" (http://www.ted.com/conversations/11310/are_you_left_handed.html), I said:
"My biggest left-handed fear is power tools, without my preferred hand control I find them dangerous."
I consider this a rational phobia because although I can and have used power tools, mostly without incident (I still have all my fingers), I do my best to avoid using them.
There are plenty of irrational fears like the fear of spiders or snakes because, well, spiders and snakes are creepy.
I'd like to hear about the rational fears hounding you that are fact or experience based.