Well at this moment I can't really think of any irrational fears that I have.. but I used to be really affraid of lake weed. Ive been boating on Okanagan Lake for my entire life, so it's kinda irrational. (I wasnt even affaid of the ogopogo!) If I fell off the tube, or fell down wile skiing or wakeboarding i would freek out if i fell in weeds. But I got over my fear quickley after I worked a summer on a waterpark that floated over a particularly heavily lake weedy part of the lake. On a few occations something would accidently drop into the water and sink to the bottom and I would have to swim thought the weeds to get it... And also swimming down to hook up anchors and such... weeds so think you had to push them out of the way to see what you were doing. well it was a bit tramatic at the time but now i am completly over my fear!