Acrophobia - I don't see how people stand over balconies and or mountains. No thanks.
Extreme fear of snakes - Hell NO! I hate those mfs especially when they strike at the screen. I try my best to avoid seeing them online.
It's not a fear necessarily but I have anticipatory anxiety sometimes. If I'm driving on a bridge I'll randomly envision the bridge collapsing for example. I also worry about cars or a plane slamming into my house.