Sailboats
!!!
I know it sounds bizarre, but I had some not-so-nice experiences on them as a kid. I am just TERRIFIED of falling off when they tip to the side. Which is weird, because I can swim really well...
But the ultimate nightmare came when I agreed to go out on a sailboat after my friend said, "Hey, you'll have fun, and we'll cure this fear once in for all!" Well, we lost a rudder, ran out of gas, and ended up having to call the Coast Guard.
Yeah, right -- "cure this fear once in for all...."
I'm also VERY afraid of sharks. I watch too much Discovery Channel, I think.