I agree that having a phobia for spiders/snakes is a survival instinct. If that is the case, then those having phobias for driving/flying/riding roller coasters, etc... may be the ones who received "advanced" genes to develop those fears. If one has a fear of say, a car (one of the biggest killers of humans), then they probably won't drive/ride in a car as often, and thus, they will likely knock out the chances of dying in an auto crash. And thus, they will be able to spread their seed over a greater amount of time.
"People develop phobias for spiders and snakes and things that were ancestral threats. It's very infrequent to have somebody afraid of cars or electrical outlets," New told LiveScience. "Those statistically pose much more of a threat to us than a tiger."
Modern Humans Retain Caveman's Survival Instincts
by Jeanna Bryner
http://news.yahoo.com/s/livescience/20070925/sc_livescience/modernhumansretaincavemanssurvivalinstincts
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